minor #16329 Clarify Pull Request Merging Policy (kbond)

This PR was submitted for the 6.1 branch but it was merged into the 4.4 branch instead.

Discussion
----------

Clarify Pull Request Merging Policy

I had a bit of confusion with the policy so I thought I'd clarify the policy based on my understanding. If my understanding is wrong, let me know!

Commits
-------

11817e1 Clarify Pull Request Merging Policy

Author: javiereguiluz

contributing/code/core_team.rst

@@ -150,9 +150,13 @@ A pull request **can be merged** if:
 
 * Enough time was given for peer reviews;
 
-* At least two **Mergers Team** members voted ``+1`` (only one if the submitter
-  is part of the Mergers team) and no Core member voted ``-1`` (via GitHub
-  reviews or as comments).
+* It is a bug fix and at least two **Mergers Team** members voted ``+1``
+  (only one if the submitter is part of the Mergers team) and no Core
+  member voted ``-1`` (via GitHub reviews or as comments).
+
+* It is a new feature and at least two **Mergers Team** members voted
+  ``+1`` (if the submitter is part of the Mergers team, two *other* members)
+  and no Core member voted ``-1`` (via GitHub reviews or as comments).
 
 Pull Request Merging Process
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~