DOC: update api_changes README to adjust the rst adornment

tacaswell · tacaswell · commit 5c12a264c36e · 2017-08-22T00:14:41.000-04:00
diff --git a/doc/api/api_changes/README.rst b/doc/api/api_changes/README.rst
@@ -3,7 +3,10 @@ a file in this folder with the name :file:`YYYY-MM-DD-[initials].rst`
 (ex :file:`2014-07-31-TAC.rst`) with contents following the form: ::
 
     Brief description of change
-    ```````````````````````````
+    ---------------------------
 
     Long description of change, justification, and work-arounds to
     maintain old behavior (if any).
+
+
+If you need more heading levels, please ``~~~~`` and ``++++``.
