update description for tests

Author: tommaso-moro

pkg/github/__toolsnaps__/list_pull_requests.snap

@@ -3,7 +3,7 @@
     "title": "List pull requests",
     "readOnlyHint": true
   },
-  "description": "List pull requests in a GitHub repository.",
+  "description": "List pull requests in a GitHub repository. If the user specifies an author, then DO NOT use this tool and use the search_pull_requests tool instead.",
   "inputSchema": {
     "properties": {
       "base": {