Cosmetic: shorten the options summary in documentation

doc/lxc-start.sgml.in

@@ -57,8 +57,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
       <arg choice="opt">-p <replaceable>pid_file</replaceable></arg>
       <arg choice="opt">-s KEY=VAL</arg>
       <arg choice="opt">-C</arg>
-      <arg choice="opt">--share-net <replaceable>name|pid</replaceable></arg>
-      <arg choice="opt">--share-ipc <replaceable>name|pid</replaceable></arg>
+      <arg choice="opt">--share-[net|ipc|uts] <replaceable>name|pid</replaceable></arg>
       <arg choice="opt">command</arg>
     </cmdsynopsis>
   </refsynopsisdiv>

src/lxc/lxc_start.c

@@ -191,9 +191,7 @@ Options :\n\
                          If not specified, exit with failure instead\n\
 		         Note: --daemon implies --close-all-fds\n\
   -s, --define KEY=VAL   Assign VAL to configuration variable KEY\n\
-      --share-net=NAME   Share a network namespace with another container or pid\n\
-      --share-ipc=NAME   Share an IPC namespace with another container or pid\n\
-      --share-uts=NAME   Share a UTS namespace with another container or pid\n\
+      --share-[net|ipc|uts]=NAME Share a namespace with another container or pid\n\
 ",
 	.options   = my_longopts,
 	.parser    = my_parser,