Updated X Action documentation (#3160)

Co-authored-by: Justin Ellingwood <[email protected]>

Author: ItRachii

docs/integrations/builtin/app-nodes/n8n-nodes-base.twitter.md

@@ -28,6 +28,10 @@ Refer to [X credentials](/integrations/builtin/credentials/twitter.md) for guida
     * Search tweets
     * Like a tweet
     * Retweet a tweet
+* User
+  	* Get a user
+* List 
+    * Add a member to a list
 
 ## Templates and examples