Explain how to test XMPP through Riseup

wiki/src/contribute/release_process/test.mdwn

@@ -112,6 +112,14 @@ tracked by tickets prefixed with `todo/test_suite:`.
 * Check that you can initiate an OTR conversation.
 * Check that IRC is working with the default OFTC profile.
 * Check that XMPP is working with a new test profile.
+  For example using Riseup:
+  - Username: username
+  - Domain: riseup.net
+  - Connect server: 4cjw6cwpeaeppfqz.onion
+  - Then try to create and connect to a new room:
+    - Room: testing
+    - Server: conference.riseup.net
+    - Handle: username
 * Check that Pidgin doesn't leak too much information when replying to
   CTCP requests:
   * Start Tails, launch Pidgin, and join #tails.