docs: add graphql subscriptions section in live provider doc

[salihozdemir]

Added a part about graphql subscriptions to live provider doc.

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[BatuhanW]

Can we add usage example in resources, pages if it's missing?

[BatuhanW]

Can we add usage example in resources, pages if it's missing?

[salihozdemir]

Can we add usage example in resources, pages if it's missing?

Both ably and graphql subscription sections have "Usage" titles to give an example of using the live provider.

[salihozdemir]

fixed #4361