message: docs: remove 'PR target: review' label
  We have switched to using Github's `Review` feature to request and track if a PR needs review. Therefore this label can be removed.
  PR Close
diff: @@ -122,7 +122,6 @@ PRs also have additional label categories that should be used to signal their st
  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 author is ready for the changes to be merged by the caretaker as soon as the PR is green (or merge-assistance label is applied and caretaker has deemed it acceptable manually). In other words, this label indicates to "auto submit when ready".
  @@ -133,6 +132,8 @@ In addition, PRs can have the following states:
  * `PR state: WIP` - PR is experimental or rapidly changing. Not ready for review or triage.
  * `PR state: blocked` - PR is blocked on an issue or other PR. Not ready for review or triage or merge.
  +When a PR is ready for review, a review should be requested using the Reviewers interface in Github.
  +
  ## PR Target
  