remove stale comment

Author: mununki

jscomp/others/jsxDOM.ml

@@ -27,9 +27,6 @@ type domRef
 
 (*
   This list isn't exhaustive. We'll add more as we go.
-  
-  Watch out! There are two props types and the only difference is the type of ref.
-  Please keep in sync.
 *)
 type domProps = {
   (* V10 compiler will enable to change label declaration to `key?: string` *)