Edit GPFS config flag help text for clarity

[Bill Owen]

The help text for gpfs config flags should be editted to be more clear.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/49032

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/49032
Committed: http://github.com/openstack/cinder/commit/203e8bf9daf35319d56612de9c8b75d36fcfafd4
Submitter: Jenkins
Branch: master

commit 203e8bf9daf35319d56612de9c8b75d36fcfafd4
Author: Bill Owen <email address hidden>
Date: Mon Sep 30 11:59:45 2013 -0700

    Improve gpfs config flag help text readability

    Modify the help text for gpfs configuration flags so that it
    reads more clearly.

    Closes-Bug: #1233288

    Change-Id: Iea41bceb496dfaa1f8625a6e3abb31794838213d