[Docs] List/Dict Comprehension Section Outdated

[cameronangliss]

Where is the problem?

https://github.com/modularml/mojo/blob/main/docs/roadmap.md

What can we do better?

It is no longer true that "Mojo's standard library has not yet grown a standard list or dictionary type", so the docs need updating.

Anything else?

I'm really looking forward to seeing List/Dict comprehensions get added to Mojo! Thanks!

[Brian-M-J]

This has already been fixed in the nightly branch: see commit 6890241.

Whenever the docs site syncs with the nightly branch (might be on the next Mojo release), this issue will automatically be fixed.

[cameronangliss]

Ok, thanks! Closing now.