Man: Update title dvd syntax

Close #7133
(cherry picked from commit 23a04c6aaf6d4d8f63c3afc5b782c5723fb60a5d)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

doc/vlc.1

@@ -45,7 +45,7 @@ recognizes several URL-style items:
 .B *.mpg, *.vob, *.avi, *.mp3, *.ogg, *.opus
 Various multimedia file formats
 .TP
-.B dvd://[<device>][@<raw device>][@[<title>][:[<chapter>][:<angle>]]]
+.B dvd://[<device>][@<raw device>][#[<title>][:[<chapter>][:<angle>]]]
 DVD device (for instance dvd:///dev/dvd). The raw device is optional and
 must have been prepared beforehand.
 .TP