docs for plan_transform

[dlfivefifty]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.02%. Comparing base (97a41a4) to head (8326042).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #209       +/-   ##
===========================================
+ Coverage    0.00%   93.02%   +93.02%     
===========================================
  Files          11       12        +1     
  Lines         856      946       +90     
===========================================
+ Hits            0      880      +880     
+ Misses        856       66      -790     

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