Add more examples and real-world use cases to the AI Assistant docs

[mdbirnstiehl]

In the Observability AI Assistant docs, and I'm sure this happens in the other solutions, there is a ton of information. It's not always obvious exactly how a user might benefit or best use some of the features. We need more of the why to go along with the how in these docs.

[mdbirnstiehl]

Description from @benironside issue:

Collaborate with the generative AI product teams to expand the use cases section.

Our AI capabilities are a key selling point, and are nuanced / complicated / flexible — in other words, not intuitive to all users. We should expand our use-cases by adding new docs that help users understand how to unlock more value from these features. These could include walkthroughs, tutorials, and even blog-style topics (more specific implementations).

As part of this, we could also consider cross-solution use-case walkthroughs, to help reduce how siloed our AI docs are across solutions. In practice, some users are using both Security and Observability, as well as Search features — maybe we can describe some of those cross-solution use-cases.