doc(rjy): polish d4pg/ppg/qrdqn policy doc

[nighood]

Description

Related Issue

TODO

Check List

• merge the latest version source branch/repo, and resolve all the conflicts
• pass style check
• pass all the tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d7a61c2) 76.78% compared to head (1db6909) 76.48%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #762      +/-   ##
==========================================
- Coverage   76.78%   76.48%   -0.30%     
==========================================
  Files         671      676       +5     
  Lines       53196    53840     +644     
==========================================
+ Hits        40847    41181     +334     
- Misses      12349    12659     +310     

Flag	Coverage Δ
unittests	76.48% <100.00%> (-0.30%)	⬇️

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