Show inherited methods in MCGrad API documentationI

[flinder]

Summary: The API documentation for MCGrad and RegressionMCGrad was missing method documentation because methods like fit() and predict() are defined in the base class _BaseMCGrad. Adding :inherited-members: to the Sphinx autodoc directive ensures these inherited methods appear in the generated documentation.

Differential Revision: D91869152

[meta-codesync]

@flinder has exported this pull request. If you are a Meta employee, you can view the originating Diff in D91869152.

[codecov-commenter]

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✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #195   +/-   ##
=======================================
  Coverage        ?   94.92%           
=======================================
  Files           ?        9           
  Lines           ?     1753           
  Branches        ?        0           
=======================================
  Hits            ?     1664           
  Misses          ?       89           
  Partials        ?        0           

Flag	Coverage Δ
unittests	94.92% <ø> (?)

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