Add admin changelog PR text format to pull-request-guidelines

src/en/general-development/codebase-info/pull-request-guidelines.md

@@ -85,6 +85,32 @@ Each entry is either an `add`, `remove`, `tweak`, or `fix`. There can be multipl
 
 Maintainers may, at their discretion, add, modify, or remove a change log entry that you suggest.
 
+#### Admin changelog
+
+Putting `ADMIN` or `ADMIN:` in the changelog will place all changelogs below it into the admin changelog instead of the standard player changelog.
+
+```
+:cl:
+ADMIN
+- add: Added fun!
+- remove: Removed fun!
+- tweak: Changed fun!
+- fix: Fixed fun!
+```
+or
+```
+:cl:
+- add: Added fun!
+- remove: Removed fun!
+- tweak: Changed fun!
+- fix: Fixed fun!
+ADMIN
+- add: Added fun!
+- remove: Removed fun!
+- tweak: Changed fun!
+- fix: Fixed fun!
+```
+
 ## Writing An Effective Changelog
 The Changelog is for *players* to be aware of new features and changes that could affect how they play the game. It is *not* designed for maintainers, admins, or server operators (these should be in the PR description).