DOC: Tidy up docstrings

[scottclowe]

No description provided.

[codecov]

Codecov Report

Merging #162 (6a7d910) into master (2c54b62) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #162   +/-   ##
=======================================
  Coverage   92.38%   92.38%           
=======================================
  Files           9        9           
  Lines         788      788           
  Branches      158      158           
=======================================
  Hits          728      728           
  Misses         32       32           
  Partials       28       28           

Flag	Coverage Δ
unittests	92.25% <ø> (ø)

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Impacted Files	Coverage Δ
fissa/core.py	94.80% <ø> (ø)
fissa/readimagejrois.py	91.46% <ø> (ø)

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