Add - Status colors in Wiki, Example per parameter

[chatelao]

This are small (but visually nice) improvements:

• Add colors: 200 = green, 300 = blue, 400 = red
• Add an example per parameter for better understanding

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• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
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[wing328]

LGMT. Thanks for the PR.

[wing328]

FYI. Updated cwiki petstore samples via 4cf66a4

[wing328]

Thanks again for the PR, which has been included in the v6.0.0 release: https://twitter.com/oas_generator/status/1529669733934841856