Replace meeting time by link to the meetings page

Change-Id: I472845503634900114d0f7aa96229e699f74d97e

Author: priteau

doc/source/contributor/meeting.rst

@@ -4,9 +4,10 @@
 Weekly Kolla team meeting
 =========================
 
-Meeting time: Wednesdays at 14:00 UTC in #openstack-kolla (`OFTC`_).
+The Kolla project meets every Wednesday in #openstack-kolla (`OFTC`_).
 
-More info on how to join: https://meetings.opendev.org/#Kolla_Team_Meeting
+More info on how to join, including the meeting time:
+https://meetings.opendev.org/#Kolla_Team_Meeting
 
 We track CI, release, and feature status in the `whiteboard`_.