fix humanize for multiline code and <para> tag

[EvgeniyZ]

The issue or feature being addressed

fix for #3282

Details on the issue fix or feature implementation

here how looks like XML documentation block from the issue

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 92.85714% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.56%. Comparing base (2efd5e9) to head (83587d1).
Report is 70 commits behind head on master.

Files with missing lines	Patch %	Lines
...re.SwaggerGen/XmlComments/XmlCommentsTextHelper.cs	92.85%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3295      +/-   ##
==========================================
+ Coverage   83.52%   83.56%   +0.04%     
==========================================
  Files          76       76              
  Lines        3210     3224      +14     
  Branches      556      559       +3     
==========================================
+ Hits         2681     2694      +13     
- Misses        529      530       +1     

Flag	Coverage Δ
Linux	83.56% <92.85%> (+0.04%)	⬆️
Windows	83.56% <92.85%> (+0.04%)	⬆️
macOS	83.56% <92.85%> (+0.04%)	⬆️

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