BIP 155: Remove bitcoin.org link.

bip-0155.mediawiki

@@ -44,8 +44,7 @@ interpreted as described in RFC 2119<ref>[https://tools.ietf.org/html/rfc2119 RF
 
 The <code>addrv2</code> message is defined as a message where <code>pchCommand == "addrv2"</code>.
 It is serialized in the standard encoding for P2P messages.
-Its format is similar to the current <code>addr</code> message format
-<ref>[https://bitcoin.org/en/developer-reference#addr Bitcoin Developer Reference: addr message]</ref>, with the difference that the 
+Its format is similar to the current <code>addr</code> message format, with the difference that the 
 fixed 16-byte IP address is replaced by a network ID and a variable-length address, and the services format has been changed to [https://en.bitcoin.it/wiki/Protocol_documentation#Variable_length_integer CompactSize].
 
 This means that the message contains a serialized <code>std::vector</code> of the following structure: