This was mentioned on the Slack channel but was not documented so have put it in.
Updated How do I send a response to all clients except sender? (markdown)
Set the code block language to JavaScript
Mistake in invalid function call `io.sockets.sockets(…)`.
pluralize 'sockets' in io.sockets.sockets(socketid)
Created How do I send a response to all clients except sender? (markdown)