docs: clarify Upgrader subprotocol negotiation - #1026
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Summary
Improve Upgrader documentation for WebSocket subprotocol negotiation.
Documents both built-in negotiation via Upgrader.Subprotocols and application-managed negotiation using Subprotocols(r) plus the Sec-Websocket-Protocol response header. Also notes that built-in negotiation overrides a protocol set only on the response header.
Fixes #404