Fixed "Output" format (#2202) - constants and conditionals-if

[yogeshCt3]

Replaced Output: to => in :
concepts/constants/about.md

Relates to issue: #2202

[github-actions]

Dear yogeshCt3

Thank you for contributing to the Go track on Exercism! 💙
You will see some automated feedback below 🤖. It would be great if you can make sure your PR covers those points. This will save your reviewer some time and your change can be merged quicker.

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_{Automated comment created by PR Commenter 🤖.}

[andrerfcsantos]

Thanks for the interest in doing this!

Left some comments.

[yogeshCt3]

updated as per suggestion :-)

[andrerfcsantos]

🚀