man: sync "OUTPUT" section and after with HOWTO

This is the continuation of below series of patches as well as the
previous commit to sync the man page with HOWTO. This commit covers the
rest of the sections.

[PATCH 0/7] Sync fio(1) man page with HOWTO
http://www.spinics.net/lists/fio/msg06008.html

This commit syncs the man page with HOWTO. It does not create new contents
that didn't exist in HOWTO, however formats (indentations, directives,
quotations, etc) are modified for some sections so that the entire man
page has consistent style.

Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>