docs: fix changelog PR link

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: quickbeard

CHANGELOG.md

@@ -252,7 +252,7 @@ already in use` and no way forward short of finding the file in a temporary
   `{file:...}` indirections deliberately left alone. Configs written by an
   older CoDev Hub are re-migrated the same way whenever the hub re-inlines a
   key.
-  ([#286](https://github.com/quickbeard/codev-code/pull/286))
+  ([#285](https://github.com/quickbeard/codev-code/pull/285))
 
 ### Desktop / Web UI