Fix configuration doc block formatting
Fix configuration doc block formatting

Many of the code blocks in the configuration documentation had extra
leading spaces. This resulted in the blocks being both code block
formatted as well as blockquoted in the output.

This patch removes leading spaces and some minor cleanup to get the
formatted output correct.

Change-Id: Ic4dfb49c547d51e16b673bc88d7b2b1a907e3258
Signed-off-by: Sean McGinnis <961eeb09b6d45516665e15b82e013282c4faf575@gmail.com>

openstack-dev/devstack,dtroyer/devstack,dtroyer/devstack,nawawi/openstack,nawawi/openstack,openstack-dev/devstack