Resolve "Document behaviour of Duo chat sub-features in Self Hosted Duo"

What does this MR do and why?

For action item in #525266 (comment 2404335278)

  • Chat sub-features, when a model is not assigned, will fallback to the model of Duo Chat till the end of time.
  • We should document the above behaviour clearly in our docs so that it is clear to our customer.

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Related to #525638 (closed)

Edited by Manoj M J [OOO]

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