Merge pull request #9723 from sue445/tweak_api_doc

Tweak api doc

doc/api/merge_requests.md

@@ -188,6 +188,7 @@ Parameters:
 - `title` (required)             - Title of MR
 - `description` (optional)       - Description of MR
 - `target_project_id` (optional) - The target project (numeric id)
+- `labels` (optional)            - Labels for MR as a comma-separated list
 ```json
 {
@@ -239,6 +240,7 @@ Parameters:
 - `title`                       - Title of MR
 - `description`                 - Description of MR
 - `state_event`                 - New state (close|reopen|merge)
+- `labels` (optional)           - Labels for MR as a comma-separated list
 ```json
 {

lib/api/merge_requests.rb

@@ -99,7 +99,7 @@ module API
       #   id (required)            - The ID of a project - this will be the source of the merge request
       #   source_branch (required) - The source branch
       #   target_branch (required) - The target branch
-      #   target_project           - The target project of the merge request defaults to the :id of the project
+      #   target_project_id        - The target project of the merge request defaults to the :id of the project
       #   assignee_id              - Assignee user ID
       #   title (required)         - Title of MR
       #   description              - Description of MR