[Edit] C# Comments

[codecademy-docs]

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Description (optional)

We would like to edit the Comments concept entry under C#. The entry lives in content/c-sharp/concepts/comments/comments.md

Please refer to the concept entry template, content standards and markdown style guide when working on the PR for this issue.

Please:

1. Add a code example explaining how to use comments.
2. Fix any typo in the entry

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