Rename "discussions" to "threads" in docs

doc/README.md

@@ -108,7 +108,7 @@ The following documentation relates to the DevOps **Plan** stage:
 | Plan Topics                                                                                                                                                                                                                                                        | Description                                                                                                                                      |
 |:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:-------------------------------------------------------------------------------------------------------------------------------------------------|
 | [Burndown Charts](user/project/milestones/burndown_charts.md) **(STARTER)**                                                                                                                                                                                        | Watch your project's progress throughout a specific milestone.                                                                                   |
-| [Discussions](user/discussions/index.md)                                                                                                                                                                                                                           | Threads, comments, and resolvable discussions in issues, commits, and  merge requests.                                                           |
+| [Discussions](user/discussions/index.md)                                                                                                                                                                                                                           | Threads, comments, and resolvable threads in issues, commits, and  merge requests.                                                           |
 | [Due Dates](user/project/issues/due_dates.md)                                                                                                                                                                                                                      | Keep track of issue deadlines.                                                                                                                   |
 | [Epics](user/group/epics/index.md) **(ULTIMATE)**                                                                                                                                                                                                                  | Tracking groups of issues that share a theme.                                                                                                    |
 | [Issues](user/project/issues/index.md), including [confidential issues](user/project/issues/confidential_issues.md),<br/>[issue and merge request templates](user/project/description_templates.md),<br/>and [moving issues](user/project/issues/managing_issues.md#moving-issues) | Project issues, restricting access to issues, create templates for submitting new issues and merge requests, and moving issues between projects. |
@@ -192,7 +192,7 @@ The following documentation relates to the DevOps **Create** stage:
 |:------------------------------------------------------------------------------------------------------------|:--------------------------------------------------------------------------------------------------------------------------------------------------|
 | [Checking out merge requests locally](user/project/merge_requests/index.md#checkout-merge-requests-locally) | Tips for working with merge requests locally.                                                                                                     |
 | [Cherry-picking](user/project/merge_requests/cherry_pick_changes.md)                                        | Use GitLab for cherry-picking changes.                                                                                                            |
-| [Merge request discussion resolution](user/discussions/index.md#moving-a-single-discussion-to-a-new-issue)  | Resolve discussions, move discussions in a merge request to an issue, and only allow merge requests to be merged if all discussions are resolved. |
+| [Merge request thread resolution](user/discussions/index.md#moving-a-single-thread-to-a-new-issue)          | Resolve threads, move threads in a merge request to an issue, and only allow merge requests to be merged if all threads are resolved. |
 | [Merge requests](user/project/merge_requests/index.md)                                                      | Merge request management.                                                                                                                         |
 | [Work In Progress "WIP" merge requests](user/project/merge_requests/work_in_progress_merge_requests.md)     | Prevent merges of work-in-progress merge requests.                                                                                                |

doc/development/code_review.md

@@ -207,9 +207,9 @@ first time.
 - Extract unrelated changes and refactorings into future merge requests/issues.
 - Seek to understand the reviewer's perspective.
 - Try to respond to every comment.
-- The merge request author resolves only the discussions they have fully
-  addressed. If there's an open reply, an open discussion, a suggestion,
-  a question, or anything else, the discussion should be left to be resolved
+- The merge request author resolves only the threads they have fully
+  addressed. If there's an open reply, an open thread, a suggestion,
+  a question, or anything else, the thread should be left to be resolved
   by the reviewer.
 - Push commits based on earlier rounds of feedback as isolated commits to the
   branch. Do not squash until the branch is ready to merge. Reviewers should be

doc/development/contributing/issue_workflow.md

@@ -248,8 +248,8 @@ If a bug seems to fall between two severity labels, assign it to the higher-seve
 - Example(s) of ~S1
   - Data corruption/loss.
   - Security breach.
-  - Unable to create an issue or merge request.
-  - Unable to add a comment or discussion to the issue or merge request.
+  - Unable to create an issue or merge request. 
+  - Unable to add a comment or thread to the issue or merge request.
 - Example(s) of ~S2
   - Cannot submit changes through the web IDE but the commandline works.
   - A status widget on the merge request page is not working but information can be seen in the test pipeline page.

doc/development/contributing/merge_request_workflow.md

@@ -74,10 +74,10 @@ request is as follows:
    can be found by running `grep css-class ./app -R`.
 1. Be prepared to answer questions and incorporate feedback into your MR with new
    commits. Once you have fully addressed a suggestion from a reviewer, click the
-   "Resolve discussion" button beneath it to mark it resolved.
-   1. The merge request author resolves only the discussions they have fully addressed.
-      If there's an open reply or discussion, a suggestion, a question, or anything else,
-      the discussion should be left to be resolved by the reviewer.
+   "Resolve thread" button beneath it to mark it resolved.
+   1. The merge request author resolves only the threads they have fully addressed.
+      If there's an open reply or thread, a suggestion, a question, or anything else,
+      the thread should be left to be resolved by the reviewer.
 1. If your MR touches code that executes shell commands, reads or opens files, or
    handles paths to files on disk, make sure it adheres to the
    [shell command guidelines](../shell_commands.md)

doc/user/award_emojis.md

@@ -7,7 +7,7 @@
 When you're collaborating online, you get fewer opportunities for high-fives
 and thumbs-ups. Emoji can be awarded to [issues](project/issues/index.md), [merge requests](project/merge_requests/index.md),
-[snippets](snippets.md), and anywhere you can have a discussion.
+[snippets](snippets.md), and anywhere you can have a thread.
 ![Award emoji](img/award_emoji_select.png)