Document clear behaviour of list options

More general for all list options. Seems to currently affect: lxc.network (clear all NICs) lxc.network.* (clear current NIC) lxc.cap.drop lxc.cap.keep lxc.cgroup lxc.mount.entry lxc.mount.auto lxc.hook lxc.id_map lxc.group lxc.environment Signed-off-by: Marko Hauptvogel <marko.hauptvogel@googlemail.com> Acked-by: Stéphane Graber <stgraber@ubuntu.com>

Document clear behaviour of list options
ff689149 · Marko Hauptvogel · Stéphane Graber · 9c3f2966 · ff689149
Commit ff689149 authored Jan 04, 2016 by Marko Hauptvogel Committed by Stéphane Graber Jan 28, 2016
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lxc.container.conf.sgml.in doc/lxc.container.conf.sgml.in +3 -1

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--- a/doc/lxc.container.conf.sgml.in
+++ b/doc/lxc.container.conf.sgml.in
@@ -72,7 +72,9 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
    <para>
      Each option in the configuration file has the form <command>key
      = value</command> fitting in one line. The '#' character means
-      the line is a comment.
+      the line is a comment. List options, like capabilities and cgroups
+      options, can be used with no value to clear any previously
+      defined values of that option.
    </para>

    <refsect2>