Add space to sentence for socket.emit description

[vercel[bot]]

@mohammedyh is attempting to deploy a commit to the SocketIO Team on Vercel.

A member of the Team first needs to authorize it.

[darrachequesne]

Merged as https://github.com/socketio/socket.io-website/commit/afb4c35a9ce4a0594bb5f477f44f2e5f68c08bcf. Thanks :+1: