fix: incorrect instructions for site documentation

[reginapizza]

I noticed the docs for how to build and serve documentation locally were wrong, so making this PR to correct it.
The make target for lint-docs was removed in #8722 but was never removed from documentation.

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.03 ⚠️

Comparison is base (9ee9289) 49.04% compared to head (f190dc3) 49.01%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #13209      +/-   ##
==========================================
- Coverage   49.04%   49.01%   -0.03%     
==========================================
  Files         246      247       +1     
  Lines       42575    42685     +110     
==========================================
+ Hits        20882    20924      +42     
- Misses      19576    19645      +69     
+ Partials     2117     2116       -1     

see 9 files with indirect coverage changes

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[crenshaw-dev]

Thanks, @reginapizza!

[crenshaw-dev]

/cherry-pick release-2.7

[crenshaw-dev]

/cherry-pick release-2.6

[crenshaw-dev]

/cherry-pick release-2.5