Additional documentation for mappings-method

[joelit]

Fixes #862

[codecov]

Codecov Report

Merging #985 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #985   +/-   ##
=========================================
  Coverage     59.12%   59.12%           
  Complexity     1548     1548           
=========================================
  Files            32       32           
  Lines          4335     4335           
=========================================
  Hits           2563     2563           
  Misses         1772     1772           

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[sonarqubecloud]

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