Fixing FAQs doc per issue #2204

[sekyondaMeta]

Description

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Please include a summary of the feature or issue being fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #2204

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Feature/Issue validation/testing

Updated FAQs page to correct broken links. This started with issue #2204 but found a couple more links to be updated.
Also updated 3 Index links to go to the pytorch website instead of github. This is is a cleaner solution for the .md sphinx issue.

Tested by building site locally and previewing the different pages. Attached screenshot of of the tests.

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[codecov]

Codecov Report

Merging #2351 (38b772a) into master (77ca82d) will decrease coverage by 0.09%.
The diff coverage is n/a.

❗ Current head 38b772a differs from pull request most recent head e2ef14e. Consider uploading reports for the commit e2ef14e to get more accurate results

@@            Coverage Diff             @@
##           master    #2351      +/-   ##
==========================================
- Coverage   69.44%   69.36%   -0.09%     
==========================================
  Files          77       77              
  Lines        3450     3450              
  Branches       57       57              
==========================================
- Hits         2396     2393       -3     
- Misses       1051     1054       +3     
  Partials        3        3              

see 1 file with indirect coverage changes

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