DOC: Improve docstrings

[scottclowe]

No description provided.

[codecov]

Codecov Report

Merging #236 (790d53b) into master (57a7c80) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #236   +/-   ##
=======================================
  Coverage   93.18%   93.18%           
=======================================
  Files           8        8           
  Lines         939      939           
  Branches      197      197           
=======================================
  Hits          875      875           
  Misses         33       33           
  Partials       31       31           

Flag	Coverage Δ
nbsmoke	66.02% <ø> (ø)
unittests	92.75% <ø> (ø)

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Impacted Files	Coverage Δ
fissa/core.py	95.36% <ø> (ø)
fissa/neuropil.py	98.33% <ø> (ø)

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