Minor changes to doc & XEP-0215 (#695)

* Update reference to Prosody bugtracker.

* Updated refernce to Prosody module.

* Remove unused child element.

The child element in the query suggests that a specific host is being requested. Neither
the Prosody implementation nor the XEP-0215 specification defines this element. Its
inclusion is ignored by the XEP-0215 server implementation.

modules/xmpp/ChatRoom.js

@@ -1040,7 +1040,7 @@ export default class ChatRoom extends Listenable {
                         .up();
 
                     // Fixes a bug in prosody 0.9.+
-                    // https://code.google.com/p/lxmppd/issues/detail?id=373
+                    // https://prosody.im/issues/issue/373
                     formsubmit
                         .c('field', { 'var': 'muc#roomconfig_whois' })
                         .c('value')

modules/xmpp/strophe.jingle.js

@@ -295,8 +295,7 @@ class JingleConnectionPlugin extends ConnectionPlugin {
         // uses time-limited credentials as described in
         // http://tools.ietf.org/html/draft-uberti-behave-turn-rest-00
         //
-        // See https://code.google.com/p/prosody-modules/source/browse/
-        // mod_turncredentials/mod_turncredentials.lua
+        // See https://modules.prosody.im/mod_turncredentials.html
         // for a prosody module which implements this.
         //
         // Currently, this doesn't work with updateIce and therefore credentials
@@ -307,8 +306,7 @@ class JingleConnectionPlugin extends ConnectionPlugin {
         this.connection.sendIQ(
             $iq({ type: 'get',
                 to: this.connection.domain })
-                .c('services', { xmlns: 'urn:xmpp:extdisco:1' })
-                .c('service', { host: `turn.${this.connection.domain}` }),
+                .c('services', { xmlns: 'urn:xmpp:extdisco:1' }),
             res => {
                 const iceservers = [];