Add example to comment.md to teach how to toggle a whole code block using block comments #1919
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Block comments allow people to uncomment/comment a whole code block by adding/removing a single '/' character.
None of the existing examples clearly demonstrates this ability, so I thought it'd be useful to do so here.
The chapter is already very small, so adding a few extra lines should be acceptable.
I actually learned this from Haskell, although I don't use it as often as Rust.
Toggling an entire code block by adding/removing a single character seems very, very useful, so I think it is worth teaching it to users and it deserves a prominent spot in this popular learning resource.