Fix broken ICE-TCP reference.
If the SOCKS5 Bytestreams negotiation fails, the parties might want to "fall back" to another transport. Currently the transport of last resort for a streaming exchange is &xep0047; as described for Jingle in &xep0261;, however if other transport methods are defined in the future (e.g. &ice-tcp;) then clients could fall back to those methods instead of IBB. The protocol flow for fallback from S5B to IBB is as follows.
+If the SOCKS5 Bytestreams negotiation fails, the parties might want to "fall back" to another transport. Currently the transport of last resort for a streaming exchange is &xep0047; as described for Jingle in &xep0261;, however if other transport methods are defined in the future (e.g. &rfc6544;) then clients could fall back to those methods instead of IBB. The protocol flow for fallback from S5B to IBB is as follows.