Broken docs for `speechbrain.alignment.ctc_segmentation`

Hi, thanks for maintaining such a wonderful library.

Looks like the documentation for speechbrain.alignment.ctc_segmentation is broken: https://speechbrain.readthedocs.io/en/latest/API/speechbrain.alignment.ctc_segmentation.html

I guess this is caused by unneeded shebang, as shown in the following: https://github.com/speechbrain/speechbrain/blob/develop/speechbrain/alignment/ctc_segmentation.py#L1-L2

Perhaps this could be related to #819 ?

[amrit110]

yes exactly @Gastron, so ill update the PR to add ctc_segmentation to docs-requirements.txt and remove numba from the mock setting.

As for other warnings, and formatting to docstrings, ill look at it and post on a separate issue.

[amrit110]

Hi @seungwonpark, seems like the issue might be that the ctc-segmentation package (https://github.com/lumaku/ctc-segmentation) needs to be installed before compiling the docs. So, perhaps a solution could be to add ctc-segmentation to requirements.txt file. It is then assumed that along with the top level repo requirements and the additional requirements for docs in docs/docs-requirements.txt, needs to be installed before compiling the html docs using make html. I could add a PR if you agree @Gastron