Fix deadlinks in docs

[kaushikb11]

What does this PR do?

Ran deadlink on Lightning docs

Does your PR introduce any breaking changes? If yes, please list them.

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cc @Borda

[github-actions]

Build Error! No Linked Issue found. Please link an issue or mention it in the body using #<issue_id>

[tchaton]

LGTM !

[Borda]

thinking can we have a job that would test all ink to be active?

[ethanwharris]

@kaushikb11 Added some suggestions for fairscale that should work. Don't think it can be done for graphcore as those links aren't listed in the intersphinx inventory on their docs :/

[codecov]

Codecov Report

Merging #10739 (a8d3454) into master (0066ff0) will decrease coverage by 0%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #10739    +/-   ##
========================================
- Coverage      92%      92%    -0%     
========================================
  Files         177      177            
  Lines       16397    16554   +157     
========================================
+ Hits        15053    15192   +139     
- Misses       1344     1362    +18