ait: improvements to ai transport channel rule page

[owenpearson]

fix a couple of issues with this page:

• The page talks about what failure you will see when you don't have the rule configured, and the side effects of configuring the rule before it gets to what a namepsace is. A new user trying to get started probably won't know what a namespace is and won't care about the error behaviour, so namespaces ought to be introduced earlier.
• The page is just called "Enable channel rules" but really it's a section of the getting started guide for AI transport detailing how to configure a specific rule required for AI Transport, the fact that you're in the getting started section of the AI Transport section is not that prominent when coming here from a link so we shouldn't leave that implicit in the page title.

https://ably-real-time.slack.com/archives/C09SY1AQGK0/p1781260131449549?thread_ts=1781090478.352169&cid=C09SY1AQGK0

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[rainbowFi]

LGTM, thanks for dealing with this!