Small fix for /src/sbin/mount_union/mount_union.8 man-page

[Einar Karttunen]

Hello

This fix is taken verbatim from NetBSD, except changing 
the sysctl name to be correct. The current man-page gives
misleading information, which is fixed by this patch.

--- mount_union.8.orig  2004-07-17 19:05:52.000000000 +0300
+++ mount_union.8       2004-07-17 19:09:29.000000000 +0300
@@ -93,6 +93,10 @@
 To enforce filesystem security, the user mounting the filesystem
 must be superuser or else have write permission on the mounted-on
 directory.
+In addition, the
+.Em vfs.usermount
+.Xr sysctl 3
+variable must be set to 1 to permit file system mounting by ordinary users.
 .Pp
 Filenames are looked up in the upper layer and then in the
 lower layer.


- Einar Karttunen