docs: improve docs for APISIX's gRPC support

[pottekkat]

Current State

The current docs does not have a lot of documentation of APISIX's gRPC support leading to users having to ask questions. @kingluo has documented some notes in a gist: https://gist.github.com/kingluo/65a247c302dd2e518fd3408c70241a77

Desired State

The notes in this gist should be added to the APISIX documentation. It needs to be decided where and how these should be added.

[nfrankel]

I think it makes to have a dedicated gRPC section

[Neilblaze]

@nfrankel +1

@navendu-pottekkat If it's up for grabs, I'd love to take it! :)

[pottekkat]

@Neilblaze Could you propose what the change would be before you make a PR?

[Neilblaze]

@navendu-pottekkat Sure! I think it's the same procedure that I did back in #8724, although I'm a bit confused about where these should be added. @nfrankel mentioned that we should have a separate gRPC section for the same, so should I list it under either "others" or in the "tutorials" section?

[github-actions]

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