[docs] update legacy collections error messages

[sarah11918]

Changes

Some legacy collections error messages were pointing to links that will no longer exist in beta 5 docs.

This updates these messages to:

• describe them as "legacy collections"
• use a link that will work, from which they can find their way to more specific docs

I didn't want to just deprecate these on next as we are still allowing both kinds of collections to work, so these errors are needed for those collections. But, since the eventual location of these docs depends on a lot of things, I've just made one simplified link for all those errors right now.

Testing

No tests, just error docs!

Docs

All error docs!

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Latest commit: 9686e52

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