update user guide about ReciprocalTransformer

[sergiobemar]

This PR has the goal to update the content of the Reciprocal Transfomer documentation. The new content includes:

• Explanation about the theoretical of this math function.
• Pros and cons of its using
• Code example in order to ease the reproducitibility with images of the obtained plots

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.89%. Comparing base (8af1691) to head (793ccfb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #788   +/-   ##
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  Coverage   97.89%   97.89%           
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  Files         107      107           
  Lines        4283     4283           
  Branches      854      854           
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  Hits         4193     4193           
  Misses         54       54           
  Partials       36       36           

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[solegalli]

Exito! fyi @sergiobemar