Add NVIDIA MPS documentation to doc index

[mreso]

Description

Adds NVIDIA MPS documentation to doc index

Fixes #(issue)

Type of change

Please delete options that are not relevant.

• Documentation change

Feature/Issue validation/testing

Please describe the Unit or Integration tests that you ran to verify your changes and relevant result summary. Provide instructions so it can be reproduced.
Please also list any relevant details for your test configuration.

• build html docs

git clone https://github.com/pytorch/pytorch_sphinx_theme
pip install -e pytorch_sphinx_theme
pip install -r ./docs/sphinx/requirements.txt
cd docs/sphinx
make html

Checklist:

• Did you have fun?
• Have you made corresponding changes to the documentation?

[codecov]

Codecov Report

Merging #2205 (b2f07ff) into master (afe8a9b) will not change coverage.
The diff coverage is n/a.

❗ Current head b2f07ff differs from pull request most recent head be58cd5. Consider uploading reports for the commit be58cd5 to get more accurate results

@@           Coverage Diff           @@
##           master    #2205   +/-   ##
=======================================
  Coverage   71.57%   71.57%           
=======================================
  Files          73       73           
  Lines        3307     3307           
  Branches       57       57           
=======================================
  Hits         2367     2367           
  Misses        937      937           
  Partials        3        3           

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