Remove disused /cdrom toplevel dir from hier(7).

Reviewed by:	gjb

Approved by:	gjb (mentor)

MFC after:	3 days

Differential Revision:	https://reviews.freebsd.org/D37472

share/man/man7/hier.7

@@ -28,7 +28,7 @@
 .\"	@(#)hier.7	8.1 (Berkeley) 6/5/93
 .\" $FreeBSD$
 .\"
-.Dd November 1, 2022
+.Dd November 22, 2022
 .Dt HIER 7
 .Os
 .Sh NAME
@@ -73,8 +73,6 @@ and
 .Xr zfs 8
 zpool cache files
 .El
-.It Pa /cdrom/
-default mount point for CD-ROM drives
 .It Pa /compat/
 normally a link to
 .Pa /usr/compat .