[docs] Documentation for audio collection
State: closed | Pull request: yes
Labels: name: documentation

name: Run CICD

name: audio

# What does this PR do ?

This PR adds documentation for audio collection.

**Collection**: audio, docs

# Changelog 
- Adding initial documentation

# Usage
To build locally:

```python
conda create -n nemo_docs python=3.10
conda activate nemo_docs
pip install -r requirements/requirements_docs.txt

cd docs
make clean && make html && make html
```

# GitHub Actions CI

The Jenkins CI system has been replaced by GitHub Actions self-hosted runners.

The GitHub Actions CI will run automatically when the "Run CICD" label is added to the PR.
To re-run CI remove and add the label again.
To run CI on an untrusted fork, a NeMo user with write access must first click "Approve and run".

# Before your PR is "Ready for review"
**Pre checks**:
- [x] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
- [ ] Did you write any new necessary tests?
- [x] Did you add or update any necessary documentation?
- [ ] Does the PR affect components that are optional to install? (Ex: Numba, Pynini, Apex etc)
  - [ ] Reviewer: Does the PR have correct import guards for all optional libraries?
  
**PR Type**:
- [ ] New Feature
- [ ] Bugfix
- [x] Documentation

If you haven't finished some of the above items you can still open "Draft" PR.


## Who can review?

Anyone in the community is free to review the PR once the checks have passed. 
[Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md) contains specific people who can review PRs to various areas.

# Additional Information
* Related to # (issue)


<!-- pylint-output-strict-mode-false -->

beep boop 🤖: 🙏 The following files have warnings. In case you are familiar with these, please try helping us to improve the code base.

---

Your code was analyzed with PyLint. The following annotations have been identified:

```
************* Module conf
docs/source/conf.py:260:0: C0116: Missing function or method docstring (missing-function-docstring)
docs/source/conf.py:23:0: W0611: Unused import sphinx_book_theme (unused-import)
************* Module nemo.collections.audio.models.audio_to_audio
nemo/collections/audio/models/audio_to_audio.py:353:0: C0301: Line too long (137/119) (line-too-long)
nemo/collections/audio/models/audio_to_audio.py:354:0: C0301: Line too long (136/119) (line-too-long)
nemo/collections/audio/models/audio_to_audio.py:355:0: C0301: Line too long (150/119) (line-too-long)
nemo/collections/audio/models/audio_to_audio.py:133:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/audio/models/audio_to_audio.py:136:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/audio/models/audio_to_audio.py:140:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/audio/models/audio_to_audio.py:144:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/audio/models/audio_to_audio.py:152:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/audio/models/audio_to_audio.py:160:4: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.62/10
```

---

Thank you for improving NeMo's documentation!