btrfs-progs: update man page for btrfs-show-super

Add '-f' option for btrfs-show-super manpage,
This option implies that sys chunk array and backup roots info
will show up.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

diff --git a/Documentation/btrfs-show-super.txt b/Documentation/btrfs-show-super.txt
index 62da625..6fee0f1 100644 (file)
--- a/Documentation/btrfs-show-super.txt
+++ b/Documentation/btrfs-show-super.txt
@@ -20,8 +20,13 @@ Mainly used for debug purpose.
 
 OPTIONS
 -------
+-f::
+Print full superblock information.
++
+Including the system chunk array and backup roots.
+
 -a::
-Print all the superblock information.
+Print information of all superblocks.
 +
 If this option is given, '-i' option will be ignored.