iostats.txt has a merged description of fields 2 and 6, but it's not obvious.
This patch adds a field 6, pointing to the merged description of field 6 in
field 2.
Signed-off-by: NDavid Hilton <david.hilton.p@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>