remove position ids and token type ids from forward args in docstring
# What does this PR do?
Fixes #21567 which indicated that the docstring for the GPTNeoX model dose not match with the forwards' arguments. 
Removed `position_ids` and `token_type_ids`
_The documentation is not available anymore as the PR was closed or merged._<|||||>Applies to all the heads, that's why I removed it from the `GPT_NEOX_INPUTS_DOCSTRING` ! Or do you mean other models? 