treewide: Fix typo in Documentation/DocBook

This patch fix spelling typo in Documentation/DocBook.
It is because .html and .xml files are generated by make htmldocs,
I have to fix a typo within the source files.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --cc arch/s390/include/asm/cio.h
Simple merge

diff --cc block/blk-core.c
Simple merge

diff --cc block/blk-map.c
Simple merge

diff --cc drivers/ata/libata-core.c
Simple merge

diff --cc drivers/base/bus.c
Simple merge

diff --cc drivers/gpu/drm/drm_crtc_helper.c
Simple merge

diff --cc drivers/input/sparse-keymap.c
Simple merge

diff --cc drivers/regulator/core.c
Simple merge

diff --cc drivers/scsi/scsi_transport_iscsi.c
Simple merge

diff --cc drivers/usb/core/message.c
Simple merge

diff --cc drivers/usb/core/urb.c
Simple merge

diff --cc fs/buffer.c
Simple merge

diff --cc fs/debugfs/inode.c
Simple merge

diff --cc include/drm/drm_fb_helper.h
Simple merge

diff --cc include/linux/hsi/hsi.h
Simple merge

diff --cc include/linux/kfifo.h
Simple merge

diff --cc include/linux/pipe_fs_i.h
Simple merge

diff --cc include/linux/skbuff.h
Simple merge

diff --cc include/linux/spi/spi.h
Simple merge

diff --cc include/linux/usb/composite.h
Simple merge

diff --cc include/net/mac80211.h
Simple merge

diff --cc kernel/relay.c
Simple merge

diff --cc kernel/signal.c
Simple merge

diff --cc net/core/dev.c
Simple merge