docs(readme): fix param brace

[danielmoncada]

Describe the PR
Updates the curly braces for _PT ReadMe, as there's an extra start brac { for the param

Relation issue
This causes GitHub Pages using Jekyll to fail for applications that use this as a vendor package

Liquid Exception: Liquid syntax error (line 421): Variable '{{tipo de parâmetro}' was not properly terminated with regexp: /\}\}/ in Source/Server/vendor/[github.com/swaggo/swag/README_pt.md](http://github.com/swaggo/swag/README_pt.md)

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (9f128b4) 83.56% compared to head (af20c63) 83.56%.

❗ Current head af20c63 differs from pull request most recent head 10b3916. Consider uploading reports for the commit 10b3916 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1647   +/-   ##
=======================================
  Coverage   83.56%   83.56%           
=======================================
  Files          19       19           
  Lines        3820     3820           
=======================================
  Hits         3192     3192           
  Misses        533      533           
  Partials       95       95           

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