Attempt to clarify the ByteString situation

See python/cpython#102092

This makes the behaviour of typing.ByteString better match its
documentation.

I also remove collections.abc.ByteString. There is no legitimate use
case for it. Let me know if you think there's a case where it would help
users to have this around.

Author: hauntsaninja

stdlib/_collections_abc.pyi

@@ -6,7 +6,6 @@ from typing import (  # noqa: Y022,Y038
     AsyncIterable as AsyncIterable,
     AsyncIterator as AsyncIterator,
     Awaitable as Awaitable,
-    ByteString as ByteString,
     Callable as Callable,
     Collection as Collection,
     Container as Container,

stdlib/typing.pyi

@@ -715,7 +715,7 @@ class TextIO(IO[str]):
     @abstractmethod
     def __enter__(self) -> TextIO: ...
 
-class ByteString(Sequence[int], metaclass=ABCMeta): ...
+ByteString = bytes | bytearray | memoryview
 
 # Functions