DOC: add documentation for generating geographic buffer methods

[Zeroto521]

No description provided.

[codecov]

Codecov Report

Merging #308 (b6c2332) into master (e1a0feb) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #308      +/-   ##
==========================================
- Coverage   99.63%   99.63%   -0.01%     
==========================================
  Files          25       25              
  Lines         555      553       -2     
  Branches       59       59              
==========================================
- Hits          553      551       -2     
  Partials        2        2              

Impacted Files	Coverage Δ
dtoolkit/geoaccessor/tool/buffer.py	100.00% <ø> (ø)
dtoolkit/geoaccessor/geodataframe.py	100.00% <100.00%> (ø)
dtoolkit/geoaccessor/geoseries.py	100.00% <100.00%> (ø)
dtoolkit/geoaccessor/tool/__init__.py	100.00% <100.00%> (ø)

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