Docfix

[jverzani]

• edit of docs
• better engineering in regula falsi and false position methods

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.94%. Comparing base (ff2a818) to head (333437a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #519   +/-   ##
=======================================
  Coverage   86.94%   86.94%           
=======================================
  Files          42       42           
  Lines        2628     2628           
=======================================
  Hits         2285     2285           
  Misses        343      343           

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