TST: Adjust geometry_area_perimeter docstring test sensitivity

[snowman2]

• Closes TST: Adjust test sensitivity #899
• Tests added

[codecov]

Codecov Report

Merging #900 (7507000) into master (95f97f6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #900   +/-   ##
=======================================
  Coverage   95.22%   95.22%           
=======================================
  Files          21       21           
  Lines        1677     1677           
=======================================
  Hits         1597     1597           
  Misses         80       80           

Impacted Files	Coverage Δ
pyproj/geod.py	91.21% <ø> (ø)

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