Add documentation on suppressing formatting rules

[cortinico]

Fixes #3480

[codecov]

Codecov Report

Merging #3503 (a7e70b4) into master (fce4177) will decrease coverage by 2.16%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3503      +/-   ##
============================================
- Coverage     79.73%   77.56%   -2.17%     
+ Complexity     2869     2804      -65     
============================================
  Files           461      461              
  Lines          8668     8668              
  Branches       1676     1676              
============================================
- Hits           6911     6723     -188     
- Misses          845     1040     +195     
+ Partials        912      905       -7     

Impacted Files	Coverage Δ	Complexity Δ
...o/gitlab/arturbosch/detekt/internal/SharedTasks.kt	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
.../arturbosch/detekt/internal/DetektMultiplatform.kt	0.00% <0.00%> (-90.91%)	0.00% <0.00%> (-3.00%)
...b/arturbosch/detekt/extensions/DetektReportType.kt	0.00% <0.00%> (-83.34%)	0.00% <0.00%> (-2.00%)
...kotlin/io/gitlab/arturbosch/detekt/DetektPlugin.kt	0.00% <0.00%> (-82.23%)	0.00% <0.00%> (-10.00%)
...o/gitlab/arturbosch/detekt/internal/DetektPlain.kt	0.00% <0.00%> (-76.48%)	0.00% <0.00%> (-5.00%)
...itlab/arturbosch/detekt/extensions/DetektReport.kt	0.00% <0.00%> (-75.00%)	0.00% <0.00%> (-3.00%)
...tlab/arturbosch/detekt/DetektCreateBaselineTask.kt	0.00% <0.00%> (-43.48%)	0.00% <0.00%> (-16.00%)
...ab/arturbosch/detekt/extensions/DetektExtension.kt	0.00% <0.00%> (-42.86%)	0.00% <0.00%> (-2.00%)
...tlab/arturbosch/detekt/extensions/DetektReports.kt	0.00% <0.00%> (-35.30%)	0.00% <0.00%> (-5.00%)
.../main/kotlin/io/gitlab/arturbosch/detekt/Detekt.kt	0.00% <0.00%> (-26.27%)	0.00% <0.00%> (-19.00%)
... and 2 more

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