Update multiple API example

[fzdy1914]

Describe the PR Update the example to use NewHandler()

Relation issue https://github.com/swaggo/gin-swagger/issues/197 https://github.com/swaggo/gin-swagger/issues/223

Additional context Reason for the fix: swaggerFiles.Handler is one single instance and patching the Prefix twice will end up making the request from first prefix invalid.

[ubogdan]

Would you mind adding a unit test proving that CSS files are accessible after accessing the second API endpoint?

[codecov[bot]]

Codecov Report

Merging #224 (791e433) into master (b9e926c) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #224   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           98        98           
=========================================
  Hits            98        98           

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