Added a third way of commenting - JSDoc style

[VisheshSingh]

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)
• My pull request targets the master branch of freeCodeCamp.
• None of my changes are plagiarized from another source without proper attribution.
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If your pull request closes a GitHub issue, replace the XXXXX below with the issue number.

Closes #XXXXX

[moT01]

You forgot to close your code block by adding the three ticks(`) at the bottom of your code @VisheshSingh - don't worry about it, I'm just going to merge this and give the article some touch up as there's some other things that could be fixed - Congratulations on your first contribution to freeCodeCamp!

[VisheshSingh]

Thanks a lot! Yay!!!!