LUDOC-313 cleanup: Remove ambiguity in quota documentation.

LUDOC-313 cleanup: Remove ambiguity in quota documentation.

Explain how to detect which version is running.

Clarify which server type you need to execute which commands
on.

Clarify which commands need to be executed on a client.

Improve readability.

Change-Id: I707c5dace26369d161cfd1a08276edf7fbada06b
Signed-off-by: Richard Henwood <richard.henwood@intel.com>
Reviewed-on: http://review.whamcloud.com/17399
Tested-by: Jenkins
Reviewed-by: John Fuchs-Chesney <john.fuchs-chesney@intel.com>