[DX-884] Addresses docs gap around rate limits

[umair-ably]

Description

Addresses docs gap around rate limits

Cannot be merged until the auth PR is merged as this links out to a page introduced in that PR

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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[AndyTWF]

This feels odd to put here - limits are about how much your package allows you to do on Ably. Per-connection rate limiting is an authentication/user control concept, should we be conflating the two?

[umair-ably]

Closing this PR — #3085 already covers per-connection rate limits on the JWT auth page, so this additional section on the limits page is not needed.