Clean up ASR augmentor config docs
It's up to you if you want to merge it or not. My concern is that we are lacking good docstrings and are trying to make up for it by adding it in the documentation LGTM merge when ready  Ideally the API documentation for this module should incorporate the above information. So just adding it to the docstring will add it to the API > It's up to you if you want to merge it or not. My concern is that we are lacking good docstrings and are trying to make up for it by adding it in the documentation

I think this one is fine to remove from the docs; everything here is already covered in the `SpectrogramAugmentation` docstring so we don't lose anything by deleting it from this page.
(https://docs.nvidia.com/deeplearning/nemo/user-guide/docs/en/main/asr/api.html#nemo.collections.asr.modules.SpectrogramAugmentation)
Removed redundant parameter table
Signed-off-by: Jocelyn Huang <jocelynh@nvidia.com>