Private property in KDoc

[kentr0w]

What's done:

Fixed bug, added tests
closes #552

[codecov]

Codecov Report

Merging #575 (0896b6f) into master (5426cd4) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #575   +/-   ##
=========================================
  Coverage     80.73%   80.74%           
- Complexity     1702     1703    +1     
=========================================
  Files            87       87           
  Lines          4345     4346    +1     
  Branches       1340     1340           
=========================================
+ Hits           3508     3509    +1     
  Misses          299      299           
  Partials        538      538           

Flag	Coverage Δ	Complexity Δ
unittests	80.74% <100.00%> (+<0.01%)	0.00 <2.00> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
...org/cqfn/diktat/ruleset/rules/kdoc/KdocComments.kt	82.45% <100.00%> (+0.15%)	62.00 <2.00> (+1.00)

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[petertrr]

lgtm