Add guardrails definitions to the docs

[yunzheng]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.40%. Comparing base (36e56dd) to head (4e4619e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #75   +/-   ##
=======================================
  Coverage   76.40%   76.40%           
=======================================
  Files          12       12           
  Lines        2729     2729           
=======================================
  Hits         2085     2085           
  Misses        644      644           

Flag	Coverage Δ
unittests	76.40% <ø> (ø)

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