HOWTO: minor fixes and backports from man page
These are minor fixes not worth separating into different commits,
which are partly backports from the previous 3 commits, and partly
its own minor fixes.
* Use proper argument name (option -> command).
* Use proper quotation (``).
* Add missing :option:`` directives.
* Add missing :file:`` directive (stat.h).
* Add indentation.
* Add missing alias (mem_align=).
* Add missing period.
* Add $ for fio command line examples
* Cleanup ordering of some ioengine specific options.
* Change inconsistent quotations for "1..N" and "N" to always use ``.
* Avoid mixing of whitespace and tab indentation within the same section/block.
* Correct fio commands' name (fio-genzipf, fio_generate_plots)
* Correct typos ("used,where", "See disable_slat" in disable_slat)
* Change "IO" to "I/O" which has been corrected in the past commits as well,
except for "IO" in the output of fio itself.
* Mention verification trigger (using magic sysrq) is Linux specific.
* Mention "Disk stats" output (using sysfs) is Linux specific.
Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>