docs: remove stale proceed parameter docs from tl.draw_graph

[RohitKattimani]

draw_graph's docstring documents a proceed parameter, but it is not part of the function's actual signature. Git history shows that it used to be a real parameter (proceed: bool, optional) and was later removed from the code, but the docstring was not updated.

I found this through numpydoc.validate() and confirmed that this is a genuine documentation drift, rather than the shared {show_save_ax}-style doc template used elsewhere in the plotting module, where parameters like ax are intentionally documented even though they are passed through **kwds.

• Closes #
• Tests included or not required because: documentation-based change
• Release notes not necessary because: documentation-based change

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.01%. Comparing base (4ab45dc) to head (abd94f0).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4300   +/-   ##
=======================================
  Coverage   80.01%   80.01%           
=======================================
  Files         132      132           
  Lines       13397    13397           
=======================================
  Hits        10719    10719           
  Misses       2678     2678           

Flag	Coverage Δ
hatch-test.low-vers	78.23% <ø> (ø)
hatch-test.pre	79.88% <ø> (ø)

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Files with missing lines	Coverage Δ
src/scanpy/tools/_draw_graph.py	69.86% <ø> (ø)

[flying-sheep]

thanks!