[MRG] Add the meaning of MRG and MRG+1 in the PR in docs.
@@ -79,7 +79,9 @@ following rules before you submit a pull request:
- Please prefix the title of your pull request with `[MRG]` (Ready for
Merge), if the contribution is complete and ready for a detailed review.
- An incomplete contribution -- where you expect to do more work before
+ Two core developers will review your code and change the prefix of the pull
+ request to `[MRG + 1]` and `[MRG + 2]` on approval, making it eligible
+ for merging. An incomplete contribution -- where you expect to do more work before
receiving a full review -- should be prefixed `[WIP]` (to indicate a work
in progress) and changed to `[MRG]` when it matures. WIPs may be useful
to: indicate you are working on something to avoid duplicated work,
