MXS-1779 Update MaxCtrl.md using autodoc.sh

Quite limited as autodoc.sh is not capable of picking up an
epilogue.

Documentation/Reference/MaxCtrl.md

@@ -34,6 +34,7 @@ For more information about the MaxScale REST API, refer to the
 * [call](#call)
 * [cluster](#cluster)
 * [api](#api)
+* [classify](#classify)
 
 ## Options
 
@@ -835,3 +836,10 @@ Perform a raw REST API call. The path definition uses JavaScript syntax to
 extract values. For example, the following command extracts all server states as
 an array of JSON values: maxctrl api get servers data[].attributes.state
 
+## classify
+
+```
+Usage: classify <statement>
+
+```
+