Add docs on env vars

[erhoo82]

What does this PR do ?

Add doc strings to env vars
Remove deprecated env var

Changelog

• Add the description of the env vars on NVLS, NVVL buffer, and others
• Remove amax reduction-related env vars

Usage

n/a

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Additional Information

• Related to # (issue)

[ericharper]

LGTM. Thanks!

[akoumpa]

@pablo-garay @ko3n1g can we force-merge? This is a docs change and force-merge would it get it off the CI queue.

[ko3n1g]

@pablo-garay @ko3n1g can we force-merge? This is a docs change and force-merge would it get it off the CI queue.

It also changes Python code by removing env vars

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.42%. Comparing base (09186c3) to head (46dd5bf).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11991      +/-   ##
==========================================
+ Coverage   30.30%   30.42%   +0.12%     
==========================================
  Files        1387     1395       +8     
  Lines      176283   177027     +744     
  Branches    27091    27142      +51     
==========================================
+ Hits        53423    53866     +443     
- Misses     118776   119072     +296     
- Partials     4084     4089       +5     

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[ananthsub]

n00b question: why can we drop setting these now?