Fix false positive in UndocumentedPublicClass

[schalkms]

Classes that are nested, non-public and undocumented are not flagged by this rule anymore.

Closes #2580

[BraisGabin]

You are talking about UndocumentedPublicClass but you edited UndocumentedPublicProperty.

[schalkms]

@BraisGabin thanks for that. I pushed the wrong branch, since I separated this issue (UndocumentedPublicClass + UndocumentedPublicProperty).

[codecov-io]

Codecov Report

Merging #2588 into master will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #2588      +/-   ##
============================================
- Coverage     25.20%   25.18%   -0.03%     
  Complexity      394      394              
============================================
  Files           379      379              
  Lines          7418     7425       +7     
  Branches       1225     1227       +2     
============================================
  Hits           1870     1870              
- Misses         5417     5424       +7     
  Partials        131      131              

Impacted Files	Coverage Δ	Complexity Δ
...in/io/gitlab/arturbosch/detekt/rules/Traversing.kt	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ekt/rules/documentation/UndocumentedPublicClass.kt	31.03% <0.00%> (-1.11%)	1.00 <0.00> (ø)

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