Added checklist component to the optional content collection tutorial.

[kannansuresh]

Description

Added checklist component to the optional content collection tutorial.

Checklist message

I can use content collections to manage groups of similar content for better performance and organization.

Discord username: kannansuresh

Screenshot

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Warnings reference

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[sarah11918]

This looks great, @kannansuresh ! I'm sure people will appreciate being able to complete the full circle. 😄

Very nice choice of wording for the checklist, too. Thank you so much for this wonderful contribution, and welcome to Team Docs! 🥳

[sarah11918]

@kannansuresh - It turns out, we don't need a key at all if there is only one checklist on a page. (They were in use in an earlier version where there were multiple checklists on the same page.)

So, I'll merge this PR, but I think there is one other place (6-islands/index) where key is still used on the checklist component, but isn't necessary.

If you'd like to make a second PR to simply remove that property, that would be really helpful! 🎉

[kannansuresh]

If you'd like to make a second PR to simply remove that property, that would be really helpful! 🎉

Done
#10655