Update PLUGINS.md

Update: Autogenerated Warning Header

Author: GarlicRot

PLUGINS.md

@@ -1,9 +1,9 @@
 <!--
-  ⚠️ DO NOT EDIT THIS FILE DIRECTLY.
-  This file is auto-generated from `data/plugins-and-themes.yml`.
-
-  To contribute a plugin or make changes, update `data/plugins-and-themes.yml`.
-  All manual edits to this file will be overwritten.
+  RusherHacks Plugin Collection - PLUGINS.md
+  NOTICE: This file is auto-generated from data/plugins-and-themes.yml.
+  Please do not edit this file directly.
+  To contribute plugins or themes, refer to the Contributing Guide (CONTRIBUTING.md) for straightforward submission instructions.
+  All changes must be submitted via a pull request to maintain consistency.
 -->
 
 ![RusherHack Logo](./Assets/RusherHacks/rh_head.png)