Change AGENTS.md to mention local skills

As the `laravel-mongodb` specific skills will now live in this repo.

Author: paulinevos

AGENTS.md

@@ -1,6 +1,6 @@
 ## MongoDB-related coding assistance
 
-If the user needs MongoDB-related skills that aren't otherwise available through e.g. Boost, such as:
+If the user needs MongoDB-related skills that aren't otherwise available through e.g. Boost or the skills directory, such as:
 
 - Inspecting Atlas system resources
 - Managing an Atlas cluster