Docs: Feedback for Vector Collection

Hi, I have some feedback about [this page](https://github.com/hazelcast/hz-docs/edit/main/docs/modules/data-structures/pages/vector-collections.adoc)

Using a vector collection within a pipeline is not included in the documentation. We need to add the following examples:

1) Using a pipeline to create/update a VectorCollection. This is in the vector search tutorial, but we also need an example of it on this page as well.

2) Using a pipeline for the similarity search. In this example, the client can be any HZ client. The search string is ingested into the pipeline, which does the embedding, the subsequent similarity search, any LLM interactions, and returns the results to the client. This opens up vector search to any HZ client - all the ML/AI work is done within the cluster.

Happy to do the editing/review once the code is in place...