Fix on_socket_raw_send and on_raw_thread_member_remove param types

docs/api.rst

@@ -388,6 +388,7 @@ Debug
     :param payload: The message that is about to be passed on to the
                     WebSocket library. It can be :class:`bytes` to denote a binary
                     message or :class:`str` to denote a regular text message.
+    :type payload: Union[:class:`bytes`, :class:`str`]
 
 Gateway
 ~~~~~~~~
@@ -1559,7 +1560,7 @@ Threads
     .. versionadded:: 2.0
 
     :param payload: The raw event payload data.
-    :type member: :class:`RawThreadMembersUpdate`
+    :type payload: :class:`RawThreadMembersUpdate`
 
 Voice
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