Updated RELEASE_NOTES.

RELEASE_NOTES.md

@@ -1,10 +1,10 @@
 # Release Notes
 
-## UNRELEASED
+## 2.81
 
 If the `propagate_local_purge` configuration variable is set to `true` in `server.json`, purged local posts generate a `Delete` activity that is sent everywhere, instead of only deleted from the filesystem.
 
-Included a small tweak to avoid being confused by implementations that return valid webfinger queries for non-account URLs (like i.e. the Wordpress ActivityPub plugin in some configurations).
+Included a small tweak to avoid being confused by implementations that return valid webfinger queries for non-account URLs (like i.e. the Wordpress ActivityPub plugin in some configurations). This helps in searching by URL.
 
 Added Ukrainian translation (contributed by wincentbalin).