Update contact.rst: Update Matrix link

Author: stdedos

doc/en/contact.rst

@@ -22,9 +22,9 @@ Contact channels
   requests to GitHub.
 
 - ``#pytest`` `on irc.libera.chat <ircs://irc.libera.chat:6697/#pytest>`_ IRC
-  channel for random questions (using an IRC client, `via webchat
-  <https://web.libera.chat/#pytest>`_, or `via Matrix
-  <https://matrix.to/#/%23pytest:libera.chat>`_).
+  channel for random questions (using an IRC client, or `via webchat
+  <https://web.libera.chat/#pytest>`)
+- ``#pytest`` `on Matrix https://matrix.to/#/#pytest:matrix.org>`.
 
 
 .. _`pytest issue tracker`: https://github.com/pytest-dev/pytest/issues