notes tweak

Author: SethTisue

2.13.16.md

@@ -32,7 +32,7 @@ The following changes are highlights of this release:
 * Do not use `rangeHash` when `rangeDiff` is 0 ([#10912](https://github.com/scala/scala/pull/10912) by [@Friendseeker](https://github.com/Friendseeker))
     * This may affect fragile code relying on ordering of hash-based collections
 * Deprecate `collection.mutable.AnyRefMap` ([#10862](https://github.com/scala/scala/pull/10862) by [@wangyum](https://github.com/wangyum))
-    * It no longer has any performance advantage over `collection.mutable.HashMap`
+    * Since Scala 2.13.0 it has no performance advantage over `collection.mutable.HashMap`
 
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