Make cache config options clearer

[OpenStack Infra]

https://review.openstack.org/269011
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
Your project "openstack/glance" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit c59b164c41f650ceaefbd9220e590e05fa0d81ef
Author: Niall Bunting <email address hidden>
Date: Mon Jan 18 11:58:00 2016 +0000

    Make cache config options clearer

    Currently the cache config options are unclear.

    The ``image_cache_stall_time`` is made to sound like it applies to all
    images rather than just incomplete images. This could give users the
    wrong impression of this option.

    The other commands are updated to make them easier to read and follow
    the capitalisation of the usages.

    DocImpact
    Change-Id: Ia7a81c37e626eddb50c59a5ed854abff52bc89fe

[Niall Bunting (niall-bunting)]

I see this is my patch, but have no idea what this is actually asking for. Just future patches?

[venkatamahesh (venkatamaheshkotha)]

These changes was updated in this table : https://github.com/openstack/openstack-manuals/blob/master/doc/config-reference/source/tables/glance-imagecache.rst.