Improve documentation of stage, group, category, feature labels

Signed-off-by: Rémy Coutable <remy@rymai.me>

PROCESS.md

@@ -267,9 +267,7 @@ The two scenarios below can [bypass the exception request in the release process
 When a bug is found:
 1. Create an issue describing the problem in the most detailed way possible.
 1. If possible, provide links to real examples and how to reproduce the problem.
-1. Label the issue properly, using the [team label](https://docs.gitlab.com/ee/development/contributing/issue_workflow.html#team-labels),
-   the [subject label](https://docs.gitlab.com/ee/development/contributing/issue_workflow.html#subject-labels)
-   and any other label that may apply in the specific case
+1. Label the issue properly, by respecting the [Partial triage level](https://about.gitlab.com/handbook/engineering/issue-triage/#partial-triage).
 1. Notify the respective Engineering Manager to evaluate and apply the [Severity label](https://docs.gitlab.com/ee/development/contributing/issue_workflow.html#severity-labels) and [Priority label](https://docs.gitlab.com/ee/development/contributing/issue_workflow.html#priority-labels).
 The counterpart Product Manager is included to weigh-in on prioritization as needed.
 1. If the ~bug is **NOT** a regression:

doc/development/contributing/index.md

@@ -93,26 +93,20 @@ When submitting code to GitLab, you may feel that your contribution requires the
 When your code contains more than 500 changes, any major breaking changes, or an external library, `@mention` a maintainer in the merge request. If you are not sure who to mention, the reviewer will add one early in the merge request process.
-## Issues
-This [documentation](issue_workflow.md) outlines the current issue process.
-- [Type labels](issue_workflow.md#type-labels)
-- [Subject labels](issue_workflow.md#subject-labels)
-- [Team labels](issue_workflow.md#team-labels)
-- [Release Scoping labels](issue_workflow.md#release-scoping-labels)
-- [Priority labels](issue_workflow.md#priority-labels)
-- [Severity labels](issue_workflow.md#severity-labels)
-- [Label for community contributors](issue_workflow.md#label-for-community-contributors)
+## Issues workflow
+This [documentation](issue_workflow.md) outlines the current issue workflow:
+- [Issue tracker guidelines](issue_workflow.md#issue-tracker-guidelines)
 - [Issue triaging](issue_workflow.md#issue-triaging)
+- [Labels](issue_workflow.md#labels)
 - [Feature proposals](issue_workflow.md#feature-proposals)
-- [Issue tracker guidelines](issue_workflow.md#issue-tracker-guidelines)
 - [Issue weight](issue_workflow.md#issue-weight)
 - [Regression issues](issue_workflow.md#regression-issues)
 - [Technical and UX debt](issue_workflow.md#technical-and-ux-debt)
-- [Stewardship](issue_workflow.md#stewardship)
-## Merge requests
+- [Technical debt in follow-up issues](issue_workflow.md#technical-debt-in-follow-up-issues)
+## Merge requests workflow
 This [documentation](merge_request_workflow.md) outlines the current merge request process.

doc/development/contributing/merge_request_workflow.md

-# Merge requests
+# Merge requests workflow
 We welcome merge requests from everyone, with fixes and improvements
 to GitLab code, tests, and documentation. The issues that are specifically suitable