Clean up wording and markdown in changelog

Author: Ericson2314

ChangeLog.md

@@ -2,9 +2,8 @@
 
 ## Unreleased
 
-* Data.WeakBag.traverse and Data.FastWeakBag.traverse have been
-  renamed to Data.WeakBag.traverse_ and Data.FastWeakBag.traverse_
-  respectively.
+* Data.WeakBag.traverse` and `Data.FastWeakBag.traverse` have been deprecated.
+  They are replaced with `Data.WeakBag.traverse_` and `Data.FastWeakBag.traverse_`, respectively.
 * Fixes a bug in `Reflex.Patch.MapWithMove.patchThatSortsMapWith` that was producing invalid `PatchMapWithMove`.
 
 ## 0.6.2.4