Bugfix. Do not check KDoc on method main

[aktsay6]

What's done

Fixed bug that MISSING_KDOC_TOP_LEVEL still checks fun main for documentation

This pull request closes #89

[codecov]

Codecov Report

Merging #509 (1ae7c86) into master (6ead4fc) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #509   +/-   ##
=========================================
  Coverage     81.80%   81.80%           
- Complexity     1543     1547    +4     
=========================================
  Files            73       73           
  Lines          3891     3892    +1     
  Branches       1242     1242           
=========================================
+ Hits           3183     3184    +1     
  Misses          210      210           
  Partials        498      498           

Flag	Coverage Δ	Complexity Δ
unittests	81.80% <100.00%> (+<0.01%)	0.00 <3.00> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
...org/cqfn/diktat/ruleset/rules/kdoc/KdocComments.kt	81.98% <100.00%> (+0.16%)	57.00 <3.00> (+4.00)

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[petertrr]

Suggested change

	if (node.elementType == FUN) {
	return node.isStandardMethod()
	}
	return false
	return node.elementType == FUN &&
	node.isStandardMethod()