Command should be elaborated

[venkatamahesh]

In https://github.com/openstack/rally/blob/master/doc/source/install.rst,
"To do that, cd to the root directory of the Rally git repository and run."
command "cd" should be elaborated. Otherwise it will be confusing the reader.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/215845

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/215845
Committed: https://git.openstack.org/cgit/openstack/rally/commit/?id=9280f23e90d82cef45e633aee7a4367e8021e5cb
Submitter: Jenkins
Branch: master

commit 9280f23e90d82cef45e633aee7a4367e8021e5cb
Author: venkatamahesh <email address hidden>
Date: Sat Aug 22 05:41:41 2015 +0530

    command is elaborated
    cd --> change directory

    Change-Id: I8284be937845971034b83bb6729daa8633cc1409
    Closes-Bug: #1487559