Remove all physical CD-ROM references from manual

docs/dosbox.1

@@ -1,5 +1,5 @@
 .\"                                      Hey, EMACS: -*- nroff -*-
-.TH DOSBOX 1 "Dec 1, 2019"
+.TH DOSBOX 1 "Dec 18, 2019"
 .\" Please adjust this date whenever revising the manpage.
 .SH NAME
 dosbox \- an x86/DOS emulator with sound/graphics
@@ -132,9 +132,7 @@ following extra commands are available:
 .HP
 .BI "MOUNT [\-t " type "] [\-size " size ]
 .I driveletter sourcedirectory 
-.BI "[\-usecd " number "] [\-label " drivelabel "] [\-freesize " freesize ] 
-.LP
-.B MOUNT \-cd
+.BI "[\-label " drivelabel "] [\-freesize " freesize ] 
 .LP
 .B MOUNT \-u driveletter
 .LP
@@ -160,8 +158,7 @@ Sets the amount of free space available on a drive in MB's. This is a more
 .BI \-label " drivelabel"
 .RI "Sets the name of the drive to " drivelabel ". Needed on some" 
 systems if the cd label isn't read correctly. Useful when a 
-program can't find its cdrom. If you don't specify a label and no
-.RB "lowlevel support is selected (" "\-usecd #" "):"
+program can't find its cdrom. If you don't specify a label:
 .RS
 .LP
 For win32: label is extracted from "Real Drive".
@@ -172,14 +169,6 @@ If you do specify a label this label will be kept as long as the drive
 is mounted. It will not be updated !!
 .RE
 .TP
-.BI \-usecd " number"
-Forces to use SDL cdrom support for drive number.
-.IR Number " can be found by "
-.BR \-cd ".
-.TP
-.B \-cd
-.RB "Displays all detected cdrom drives and their numbers. Use with " \-usecd "."
-.TP
 .B \-u
 Unmounts a mounted drive. Doesn't work on virtual Drives (like Z:\\)
 .RE