manpages: Use canonical names for Linux filesystems

The manpages of linprocfs(5) and linsysfs(5) document incomplete names without
"fs" suffix. Make them identical to other filesystems.

PR:		283079
MFC after:	3 days
Reviewed by:	ziaee, markj
Differential Revision:	https://reviews.freebsd.org/D53155

share/man/man4/linprocfs.4

@@ -9,7 +9,7 @@
 .Nd Linux process file system
 .Sh SYNOPSIS
 .Bd -literal
-linproc		/compat/linux/proc	linprocfs	rw 0 0
+linprocfs		/compat/linux/proc	linprocfs	rw 0 0
 .Ed
 .Sh DESCRIPTION
 The Linux process file system, or
@@ -138,7 +138,7 @@ To mount a
 file system on
 .Pa /compat/linux/proc :
 .Pp
-.Dl "mount -t linprocfs linproc /compat/linux/proc"
+.Dl "mount -t linprocfs linprocfs /compat/linux/proc"
 .Sh SEE ALSO
 .Xr mount 2 ,
 .Xr unmount 2 ,

share/man/man4/linsysfs.4

@@ -9,7 +9,7 @@
 .Nd Linux kernel objects file system
 .Sh SYNOPSIS
 .Bd -literal
-linsys		/compat/linux/sys	linsysfs	rw 0 0
+linsysfs		/compat/linux/sys	linsysfs	rw 0 0
 .Ed
 .Sh DESCRIPTION
 The
@@ -66,7 +66,7 @@ The PCI device hierarchy node.
 .Sh EXAMPLES
 The most common usage follows:
 .Pp
-.Dl "mount -t linsysfs linsys /compat/linux/sys"
+.Dl "mount -t linsysfs linsysfs /compat/linux/sys"
 .Pp
 where
 .Pa /compat/linux/sys