Merge pull request #1604 from Diapolo/fix_comment_net

fix a comment in net.cpp

src/net.cpp

@@ -407,7 +407,7 @@ bool GetMyExternalIP(CNetAddr& ipRet)
 
 void ThreadGetMyExternalIP(void* parg)
 {
-    // Make this thread recognisable as the message handling thread
+    // Make this thread recognisable as the external IP detection thread
     RenameThread("bitcoin-ext-ip");
 
     CNetAddr addrLocalHost;