Update doc style

[gwaybio]

Description

Closes #180

@niranjchandrasekaran - can you check this PR closely? By closely I also mean if I missed updating any functions.

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• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

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• I have read the CONTRIBUTING.md guidelines.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
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• I have made corresponding changes to the documentation.
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[niranjchandrasekaran]

@gwaygenomics I found a few Returns missing in the docstrings. I have highlighted those. Apart from that, as you probably know already, some functions have helpful examples in the docstring while others don't. Perhaps we should make it a task for version 0.2.

Lastly, in pycytominer/cyto_utils/load.py docstrings should say Parameters instead of Arguments and Returns instead of Return. Also load_npz() is missing Returns.

Everything else looks good.

[codecov-commenter]

Codecov Report

Merging #185 (442219e) into master (1279cd2) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #185      +/-   ##
==========================================
- Coverage   98.07%   98.04%   -0.03%     
==========================================
  Files          52       50       -2     
  Lines        2438     2403      -35     
==========================================
- Hits         2391     2356      -35     
  Misses         47       47              

Flag	Coverage Δ
unittests	98.04% <ø> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
pycytominer/consensus.py	100.00% <ø> (ø)
pycytominer/cyto_utils/annotate_custom.py	96.87% <ø> (ø)
pycytominer/cyto_utils/cells.py	96.26% <ø> (ø)
pycytominer/cyto_utils/load.py	88.00% <ø> (ø)
pycytominer/cyto_utils/modz.py	97.14% <ø> (ø)
pycytominer/cyto_utils/output.py	100.00% <ø> (ø)
pycytominer/cyto_utils/single_cell_ingest_utils.py	100.00% <ø> (ø)
pycytominer/cyto_utils/write_gct.py	100.00% <ø> (ø)
pycytominer/feature_select.py	94.59% <ø> (ø)
pycytominer/operations/__init__.py	100.00% <ø> (ø)
... and 5 more

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[gwaybio]

Thanks for the careful review @niranjchandrasekaran - I've addressed all your comments, and will now merge!