README nits

README.md

@@ -251,15 +251,15 @@ if:
   # "has_valid_signatures_by" is satisfied if the commits in the pull request
   # all have git commit signatures that have been verified by GitHub, and
   # the authenticated signatures are attributed to a user in the users list 
-  # or belong to any of the listed organizations or teams.
+  # or belong to a user in any of the listed organizations or teams.
   has_valid_signatures_by:
     users: ["user1", "user2", ...]
     organizations: ["org1", "org2", ...]
     teams: ["org1/team1", "org2/team2", ...]
 
   # "has_valid_signatures_by_keys" is satisfied if the commits in the pull request
   # all have git commit signatures that have been verified by GitHub, and
-  # the authenticated signatures are attributed to a key in the list of key-ids.
+  # the authenticated signatures are attributed to a GPG key with an ID in the list.
   has_valid_signatures_by_keys:
     key_ids: ["3AA5C34371567BD2"]