Added crosslinks to Action Filters subsection of controller docs

docs/guide/controller.md

@@ -183,7 +183,7 @@ Action Filters
 
 Action filters are implemented via behaviors. You should extend from `ActionFilter` to
 define a new filter. To use a filter, you should attach the filter class to the controller
-as a behavior. For example, to use the `AccessControl` filter, you should have the following
+as a behavior. For example, to use the [[AccessControl]] filter, you should have the following
 code in a controller:
 
 ```php
@@ -200,7 +200,8 @@ public function behaviors()
 }
 ```
 
-more TDB
+In order to learn more about access control check [authorization](authorization.md) section of the guide.
+Two other filters, [[PageCache]] and [[HttpCache]] are described in [caching](caching.md) section of the guide.
 
 Catching all incoming requests
 ------------------------------