sysupdate: In the auto-enable service, don't enable all features

The auto-enable service should activate suggested components and
features but enabled all features which includes the default components
unsuggested features and any unsuggested features of the suggested
components. This is unexpected behavior and we rather want this service
to be limited to suggested features.
Switch the service flag to suggested and make the wording more explicit
in the man page. Also fix the wrong statement that it operates on
enabled components, it operates on all components, also explicitly
disabled ones.

man/systemd-sysupdate.xml

@@ -89,7 +89,7 @@
     separately.</para>
 
     <para>The <filename>systemd-sysupdate-auto-enable.service</filename> system service automatically enables all
-    suggested components and all features of the enabled components before each update. It is ordered before and
+    suggested components and all suggested features of all components before each update. It is ordered before and
     pulled in by <filename>systemd-sysupdate-update.service</filename>, and is not enabled by default. Enable it
     if newly suggested components and features shall be picked up automatically as they become available, rather
     than requiring manual <command>enable-component</command>/<command>enable-feature</command> invocations.</para>

units/systemd-sysupdate-auto-enable.service

@@ -15,7 +15,7 @@ Before=systemd-sysupdate-update.service
 [Service]
 Type=oneshot
 ExecStart=systemd-sysupdate enable-component --component-suggested
-ExecStart=systemd-sysupdate enable-feature --component-all --feature-all
+ExecStart=systemd-sysupdate enable-feature --component-all --feature-suggested
 
 [Install]
 WantedBy=systemd-sysupdate-update.service