Humanize multi line code tag

[EvgeniyZ]

The issue or feature being addressed

Resolves #3069

Details on the issue fix or feature implementation

for some reason swagger ui <pre><code> is cutting first line from code block

<code>this content is cutted
{
   "Id": 1
}
</code>

here's how GetAll looks like

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.

Project coverage is 83.62%. Comparing base (5ecbb3b) to head (b3bfdba).

Files with missing lines	Patch %	Lines
...re.SwaggerGen/XmlComments/XmlCommentsTextHelper.cs	84.21%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3239      +/-   ##
==========================================
- Coverage   84.83%   83.62%   -1.21%     
==========================================
  Files          76       76              
  Lines        3165     3182      +17     
  Branches      536      538       +2     
==========================================
- Hits         2685     2661      -24     
- Misses        480      521      +41     

Flag	Coverage Δ
Linux	83.62% <84.21%> (+15.12%)	⬆️
Windows	83.62% <84.21%> (+0.02%)	⬆️
macOS	83.62% <84.21%> (+0.02%)	⬆️

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[martincostello]

Thanks!