Update to reflect new location at github.

Additionally it does not appear there is turnserver.conf.default, but rather, just /etc/turnserver.conf.

docs/turn-howto.rst

@@ -9,15 +9,17 @@ the Home Server to generate credentials that are valid for use on the TURN
 server through the use of a secret shared between the Home Server and the
 TURN server.
 
-This document described how to install coturn
-(https://code.google.com/p/coturn/) which also supports the TURN REST API,
+This document describes how to install coturn
+(https://github.com/coturn/coturn) which also supports the TURN REST API,
 and integrate it with synapse.
 
 coturn Setup
 ============
 
+You may be able to setup coturn via your package manager,  or set it up manually using the usual ``configure, make, make install`` process.  
+
  1. Check out coturn::
-      svn checkout http://coturn.googlecode.com/svn/trunk/ coturn
+      svn checkout https://github.com/coturn/coturn.git coturn  
       cd coturn  
 
  2. Configure it::
@@ -32,8 +34,7 @@ coturn Setup
       make  
       make install  
 
- 4. Make a config file in /etc/turnserver.conf. You can customise
-    a config file from turnserver.conf.default. The relevant
+ 4. Create or edit the config file in ``/etc/turnserver.conf``. The relevant
     lines, with example values, are::
 
       lt-cred-mech  
@@ -41,7 +42,7 @@ coturn Setup
       static-auth-secret=[your secret key here]  
       realm=turn.myserver.org  
 
-    See turnserver.conf.default for explanations of the options.
+    See turnserver.conf for explanations of the options.
     One way to generate the static-auth-secret is with pwgen::
 
        pwgen -s 64 1  
@@ -91,3 +92,4 @@ Now, restart synapse::
     ./synctl restart
 
 ...and your Home Server now supports VoIP relaying!
+