Add missing h docstring information to _geos_area.py

[longtsing]

fix the document of get_area_extent function,add the description of parameter h .

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.92%. Comparing base (3aa2f79) to head (25746fd).
Report is 1 commits behind head on main.

❗ Current head 25746fd differs from pull request most recent head 72ff58a. Consider uploading reports for the commit 72ff58a to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #2750    +/-   ##
========================================
  Coverage   95.92%   95.92%            
========================================
  Files         377      375     -2     
  Lines       53535    53167   -368     
========================================
- Hits        51356    51003   -353     
+ Misses       2179     2164    -15     

Flag	Coverage Δ
behaviourtests	4.13% <ø> (+0.02%)	⬆️
unittests	96.02% <ø> (+<0.01%)	⬆️

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[longtsing]

The document content has been modified as required

[ameraner]

LGTM, thanks for this!