DOAP: Update RFCs and fix typo
Link to https://xmpp.org/rfcs/rfc7590.html
is 404, replaced by ietf link.
Added https://tools.ietf.org/html/rfc7395
WebSocket
Fixed typo: XEP-0373
Link to https://xmpp.org/rfcs/rfc7590.html
is 404, replaced by ietf link.
Added https://tools.ietf.org/html/rfc7395
WebSocket
Fixed typo: XEP-0373