Remove Channels FAQs

[franrob-projects]

This PR integrates the following FAQs int the docs:

• Can I delete messages which have been persisted through the history API?

• Is it possible to check if a specific message has been delivered to a device?

• Reliable message ordering for connected clients

• Am I able to check who has read published messages?

• Client-specified message ID restrictions for multiple messages published atomically

• I'm not receiving messages, how do I debug that?

• Can I see messages sent by Channel or ClientID?

• How does Ably count and bill for messages?

• How can I reduce my message count?

• Is there a maximum number of channels per connection?

• Can I attach and subscribe to channels using wildcards?

• How can I implement presence subscriptions efficiently, in terms of limits?

• Can I use webhooks or other rules to maintain an external copy of the presence set of a channel or channels?

• Why don't presence members leave as soon as I close a tab?

• I don't understand why I see so many presence messages in my stats.

• Why do you have a limit on the number of members present on a channel?

• What does it mean if I see 'Channel Region Inactive' in my logs on the Dev Console?

• How to limit user numbers in channels

• Can I make a History Call to several Channels Simultaneously?

• Common misconceptions around Ably History

• How synchronized / up to date is channel history betweendatacenters / regions?

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• Tidy up commit

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Redirects: Here
Jira: EDU-2075
FAQ: Here

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch EDU-2075-remove-channels-fags

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