doc work and formatting continued (random_region, util, ward)

[jGaboardi]

This PR continues pushing towards a completion of #173 --> #280 and covers:

• random_region.py
• util.py
• ward.py

[codecov]

Codecov Report

Merging #307 (480d12c) into main (b4044bb) will decrease coverage by 0.0%.
The diff coverage is 63.2%.

@@           Coverage Diff           @@
##            main    #307     +/-   ##
=======================================
- Coverage   73.9%   73.9%   -0.0%     
=======================================
  Files         23      23             
  Lines       2417    2411      -6     
  Branches     463     463             
=======================================
- Hits        1786    1781      -5     
+ Misses       573     572      -1     
  Partials      58      58             

Impacted Files	Coverage Δ
spopt/region/base.py	97.6% <ø> (ø)
spopt/region/util.py	58.0% <50.0%> (+0.3%)	⬆️
spopt/region/random_region.py	96.8% <83.3%> (-0.1%)	⬇️
spopt/region/ward.py	100.0% <100.0%> (ø)

[jGaboardi]

This is ready for a review when you have a moment, @sjsrey.