Feature/add support to request body example

[brunohafonso]

first i want to thank you for this amazing package i always use in all of my projects.

So in the current project that i'm working i have the need to add body param examples and seeing the package it does not have support to it so i think that will be great add this capability to the package, i hope that you like of the PR and if have anything to question or contest, please let me know.