Bring back shortcut [fix CHANGELOG] (#2246)

* Bring back a convenient short-cut for infix Func

* change name as per suggestion from Matthew

* propagate use of shortcut to where it increases readability

* Revert "propagate use of shortcut to where it increases readability"

This reverts commit debfec1.

* Move definitions up. Fix comments.

* fix CHANGELOG to report the correct syntax.

CHANGELOG.md

@@ -86,5 +86,5 @@ Additions to existing modules
   map : (Char → Char) → String → String
   ```
 
-* In `Function.Bundles`, added `_➙_` as a synonym for `Func` that can
+* In `Function.Bundles`, added `_⟶ₛ_` as a synonym for `Func` that can
   be used infix.