doc: use more modern file system type examples in df description

* doc/coreutils.texi (df invocation): In the example list of common
file system types, exchange the entries which are not so common
anymore (4.2, ufs, efs, hsfs, pcfs) by far more prominent ones
(ext2, ext3, ext4, xfs, btrfs, iso9660, ntfs, fat).

1 files changed, 18 insertions, 14 deletions

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index 5139809b2..aef5cc9f9 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -11268,30 +11268,34 @@ An NFS file system, i.e., one mounted over a network from another
 machine.  This is the one type name which seems to be used uniformly by
 all systems.
 
-@item 4.2@r{, }ufs@r{, }efs@dots{}
+@item ext2@r{, }ext3@r{, }ext4@r{, }xfs@r{, }btrfs@dots{}
 @cindex Linux file system types
 @cindex local file system types
-@opindex 4.2 @r{file system type}
-@opindex ufs @r{file system type}
-@opindex efs @r{file system type}
+@opindex ext2 @r{file system type}
+@opindex ext3 @r{file system type}
+@opindex ext4 @r{file system type}
+@opindex xfs @r{file system type}
+@opindex btrfs @r{file system type}
 A file system on a locally-mounted hard disk.  (The system might even
 support more than one type here; Linux does.)
 
-@item hsfs@r{, }cdfs
+@item iso9660@r{, }cdfs
 @cindex CD-ROM file system type
-@cindex High Sierra file system
-@opindex hsfs @r{file system type}
+@cindex DVD file system type
+@cindex ISO9660 file system type
+@opindex iso9660 @r{file system type}
 @opindex cdfs @r{file system type}
-A file system on a CD-ROM drive.  HP-UX uses @samp{cdfs}, most other
-systems use @samp{hsfs} (@samp{hs} for ``High Sierra'').
+A file system on a CD or DVD drive.  HP-UX uses @samp{cdfs}, most other
+systems use @samp{iso9660}.
 
-@item pcfs
-@cindex PC file system
+@item ntfs@r{,}fat
+@cindex NTFS file system
 @cindex DOS file system
 @cindex MS-DOS file system
-@cindex diskette file system
-@opindex pcfs
-An MS-DOS file system, usually on a diskette.
+@cindex MS-Windows file system
+@opindex ntfs @r{file system file}
+@opindex fat @r{file system file}
+File systems used by MS-Windows / MS-DOS.
 
 @end table