docs: Update FactorAnalyzer docstring

[juanbeniteza]

docstring was updated to change the mentions of analyze() to fit()

[codecov-commenter]

Codecov Report

Merging #58 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #58   +/-   ##
=======================================
  Coverage   94.51%   94.51%           
=======================================
  Files           5        5           
  Lines         820      820           
=======================================
  Hits          775      775           
  Misses         45       45           

Impacted Files	Coverage Δ
factor_analyzer/factor_analyzer.py	94.34% <ø> (ø)

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[desilinguist]

Thank you!