doc, block, bfq: better describe how to properly configure bfq

Many users have reported the lack of an HOWTO for properly configuring
bfq as a function of the goal one wants to achieve (max
responsiveness, max throughput, ...). In fact, all needed details are
already provided in the documentation file bfq-iosched.txt. Yet the
document lacks guidance on which parameter descriptions to look
at. This commit adds some simple direction.

Signed-off-by: Paolo Valente <[email protected]>
Reviewed-by: Jeremy Hickman <[email protected]>
Reviewed-by: Laurentiu Nicola <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

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