zipl: fix zipl.conf man page example for secure boot

The secure= option is not supported in the defaultboot section when a
menu is used. It should be placed in the menu section in this case.

Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

zipl/man/zipl.conf.5.in

@@ -87,8 +87,6 @@ below).
 .br
 defaultmenu = menu1
 .br
-secure = auto
-.br
 
 [linux]
 .br
@@ -122,6 +120,8 @@ prompt      = 1
 .br
 timeout     = 0
 .br
+secure      = auto
+.br
 .PP
 
 .B BootLoaderSpec configuration files
@@ -533,7 +533,7 @@ non-default memory location.
 .B secure
 =
 .IR auto / 1 / 0
-(configuration only)
+(configuration and menu)
 .IP
 .B Configuration section:
 .br