Fix /submit_type to return only uppercase names

Instead of returning the literal string from Prolog, force it to
uppercase the way ChangeControl does as it casts the name through
the Project.SubmitType enum.

Change-Id: I8caca1c92d8ff30a70270f1e1b004a4c5265ab5b
diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index 2cc1f50..bccf018 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -1611,7 +1611,7 @@
   Content-Type: application/json;charset=UTF-8
 
   )]}'
-  "cherry_pick"
+  "CHERRY_PICK"
 ----
 
 [[test-submit-rule]]