Clear DOC_CHANGES (empty for 12.13)

DOC_CHANGES.md

@@ -6,15 +6,4 @@ Example Doc Change:
 Description of the required change.
 -->
 
-## Doc changes for Chef 12.11
-
-### RFC 062 Exit Status Support
-
-Starting with Chef Client 12.11, there is support for the consistent, standard exit codes as defined in [Chef RFC 062](https://github.com/chef/chef-rfc/blob/master/rfc062-exit-status.md).
-
-With no additional configuration when Chef Client exits with a non-standard exit code a deprecation warning will be issued advising users of the upcoming change in behavior.
-
-To enable the standardized exit code behavior, there is a new setting in client.rb.  The `exit_status` setting, when set to `:enabled` will enforce standarized exit codes.  In a future release, this will become the default behavior.
-
-If you need to maintain the previous exit code behavior to support your current workflow, you can disable this (and the deprecation warnings) by setting `exit_status` to `:disabled`.
-
+## Doc changes for Chef 12.13