fix(ai): Fix broken links and update docs per cl

[daymxn]

A few of the links in the docs were not properly linking to their respective classes, as they needed to be fully qualified (eg; instead of connect() we needed LiveGenerativeModel/connect()). These were addressed in the docs on devsite, but not in the source code. This PR addresses them.

This PR also fixes various doc issues that Rachel brought up in the doc CL, and wanted changed for next release.

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[paulb777]

Nice cleanups. Thanks!