Merge pull request #1736 from abourget/document_supervisorctl

supervisorctl: document the 'present' option

library/supervisorctl

@@ -37,7 +37,7 @@ options:
       - The state of service
     required: true
     default: null
-    choices: [ "started", "stopped", "restarted" ]
+    choices: [ "present", "started", "stopped", "restarted" ]
 examples:
    - code: "supervisorctl: name=my_app state=started"
      description: Manage the state of program I(my_app) to be in I(started) state.