Document Console Reports code

[schalkms]

as noted in #2869

[codecov]

Codecov Report

Merging #2913 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2913   +/-   ##
=========================================
  Coverage     80.15%   80.15%           
  Complexity     2429     2429           
=========================================
  Files           421      421           
  Lines          7384     7384           
  Branches       1354     1354           
=========================================
  Hits           5919     5919           
  Misses          764      764           
  Partials        701      701           

Impacted Files	Coverage Δ	Complexity Δ
.../detekt/core/reporting/console/ComplexityReport.kt	100.00% <ø> (ø)	4.00 <0.00> (ø)
.../core/reporting/console/FileBasedFindingsReport.kt	100.00% <ø> (ø)	5.00 <0.00> (ø)
...ch/detekt/core/reporting/console/FindingsReport.kt	100.00% <ø> (ø)	5.00 <0.00> (ø)
...etekt/core/reporting/console/NotificationReport.kt	100.00% <ø> (ø)	4.00 <0.00> (ø)
.../core/reporting/console/ProjectStatisticsReport.kt	100.00% <ø> (ø)	4.00 <0.00> (ø)

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