Docs update for misc image functions

[wtgee]

• Better docs for crop_data and mask_saturated.

[codecov[bot]]

Codecov Report

Merging #300 (53df150) into develop (050e072) will increase coverage by 0.85%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #300      +/-   ##
===========================================
+ Coverage    89.33%   90.18%   +0.85%     
===========================================
  Files           26       26              
  Lines         1528     1528              
===========================================
+ Hits          1365     1378      +13     
+ Misses         163      150      -13     

Impacted Files	Coverage Δ
src/panoptes/utils/images/misc.py	100.00% <ø> (+29.54%)	:arrow_up:
src/panoptes/utils/images/plot.py	100.00% <ø> (ø)

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