message: docs: update merge label meaning
  PR Close
diff: @@ -126,7 +126,7 @@ Every triaged PR must have a `pr_action` label assigned to it:
  * `PR action: review` - work is complete and comment is needed from the reviewers.
  * `PR action: cleanup` - more work is needed from the author.
  * `PR action: discuss` - discussion is needed, to be led by the author.
  -* `PR action: merge` - the PR is ready to be merged by the caretaker.
  +* `PR action: merge` - the PR author is ready for the changes to be merged by the caretaker.
  In addition, PRs can have the following states:
  