chore[docs]: add method_id to abi_encode signature (#4355)

this commit adds the missing `method_id` parameter to the
function signature of `abi_encode` in the documentation

docs/built-in-functions.rst

@@ -1023,7 +1023,7 @@ Utilities
         >>> ExampleContract.foo()
 	0xa9059cbb
 
-.. py:function:: abi_encode(*args, ensure_tuple: bool = True) -> Bytes[<depends on input>]
+.. py:function:: abi_encode(*args, ensure_tuple: bool = True, method_id: Bytes[4] = None) -> Bytes[<depends on input>]
 
     Takes a variable number of args as input, and returns the ABIv2-encoded bytestring. Used for packing arguments to raw_call, EIP712 and other cases where a consistent and efficient serialization method is needed.
     Once this function has seen more use we provisionally plan to put it into the ``ethereum.abi`` namespace.