Various mdoc(7) fixes:

	 Add devfs(5) reference                   - make_dev.9
	 Change .Xr from VFS_VGET(9) to vget(9)   - vnode.9
	 Spelling fix, 'useage' to 'usage'        - zone.9

Approved by:	des (mentor)

3 files changed, 4 insertions, 2 deletions

diff --git a/share/man/man9/make_dev.9 b/share/man/man9/make_dev.9
index 2c6fa7e..d819fcd 100644
--- a/share/man/man9/make_dev.9
+++ b/share/man/man9/make_dev.9
@@ -121,6 +121,8 @@ child device(s),
 if any exist.
 A device may simultaneously be a parent and a child,
 so it is possible to build a complete hierarchy.
+.Sh SEE ALSO
+.Xr devfs 5
 .Sh HISTORY
 The
 .Fn make_dev
diff --git a/share/man/man9/vnode.9 b/share/man/man9/vnode.9
index f57d9b6..3191299 100644
--- a/share/man/man9/vnode.9
+++ b/share/man/man9/vnode.9
@@ -80,7 +80,7 @@ and
 system calls.
 .Pp
 Any call which returns a vnode (e.g.\&
-.Xr VFS_GET 9 ,
+.Xr vget 9 ,
 .Xr VOP_LOOKUP 9
 etc.)
 will increase the
diff --git a/share/man/man9/zone.9 b/share/man/man9/zone.9
index 43076b9..6c97465 100644
--- a/share/man/man9/zone.9
+++ b/share/man/man9/zone.9
@@ -105,7 +105,7 @@ respectively.
 Their purpose is to provide hooks for initializing or
 destroying things that need to be done at the time of the allocation
 or release of a resource.
-A good useage for the
+A good usage for the
 .Fa ctor
 and
 .Fa dtor