docs: add warning regarding using socket.data reference equality

[nedgrady]

Related: https://github.com/socketio/socket.io/discussions/4935

This adds to the Socket#data, there are a few other places that mentioned socket.data

https://socket.io/docs/v4/server-instance/#fetchsockets https://socket.io/docs/v4/server-api/#socketdata

So happy to move to either of these places.

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