Minor change to the comment

Author: sullof

ERCS/erc-7656.md

@@ -157,7 +157,7 @@ The reference implementation of `ERC7656Registry` is mutated from `ERC6551Regist
 
 ```solidity
 contract ERC7656Registry is IERC7656Registry {
-  // this implementation is a variation of ERC6551Registry, which non being yet finalized cannot be referenced in this ERC.
+// this implementation is mutated from https://github.com/erc6551/reference
 
   function create(
     address implementation,