Clean up scico.solver module

[bwohlberg]

• Remove explicit copies of docstrings from scipy.optimize
• Remove ToDo notes from docstring and code

Resolves #109.

[codecov]

Codecov Report

Merging #125 (dad8e0a) into main (f5a18cb) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #125   +/-   ##
=======================================
  Coverage   90.89%   90.89%           
=======================================
  Files          42       42           
  Lines        2997     2997           
=======================================
  Hits         2724     2724           
  Misses        273      273           

Flag	Coverage Δ
unittests	90.89% <100.00%> (ø)

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Impacted Files	Coverage Δ
scico/solver.py	98.88% <100.00%> (ø)

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