[trivial] Cleanup config.yaml

Partially-Closes-Bug: 1473426

config.yaml

@@ -6,14 +6,24 @@ options:
       Repository from which to install.  May be one of the following:
       distro (default), ppa:somecustom/ppa, a deb url sources entry,
       or a supported Cloud Archive release pocket.
-      .
-      Supported Cloud Archive sources include: cloud:precise-folsom,
-      cloud:precise-folsom/updates, cloud:precise-folsom/staging,
-      cloud:precise-folsom/proposed.
-      .
-      Note that updating this setting to a source that is known to
-      provide a later version of OpenStack will trigger a software
-      upgrade.
+
+      Supported Cloud Archive sources include:
+
+      cloud:<series>-<openstack-release>
+      cloud:<series>-<openstack-release>/updates
+      cloud:<series>-<openstack-release>/staging
+      cloud:<series>-<openstack-release>/proposed
+
+      For series=Precise we support cloud archives for openstack-release:
+         * icehouse
+
+      For series=Trusty we support cloud archives for openstack-release:
+         * juno
+         * kilo
+         * ...
+
+      NOTE: updating this setting to a source that is known to provide
+      a later version of OpenStack will trigger a software upgrade.
   block-device:
     default: sdb
     type: string
@@ -70,7 +80,7 @@ options:
       If True enables IPv6 support. The charm will expect network interfaces
       to be configured with an IPv6 address. If set to False (default) IPv4
       is expected.
-      .
+
       NOTE: these charms do not currently support IPv6 privacy extension. In
       order for this charm to function correctly, the privacy extension must be
       disabled and a non-temporary address must be configured/available on