note the removal of deprecated interfaces

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65841 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index 3eab4eb..56eea95 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -613,7 +613,8 @@
 API changes are:</p>
 
 <ul>
-<li>?</li>
+<li>Some deprecated interfaces to create <tt>Instruction</tt> subclasses, that
+    were spelled with lower case "create", have been removed.</li>
 </ul>
 
 </div>