misspelling in the documentation "README.rst"

[zhangfeng]

I'm spell checking the README.rst.
There are some spelling mistakes in the README.rst.

Detail is as followed

 - Tempest should be self testing.
 ...
 The etc/tempest.conf.sample attempts to be a self documenting version of the configuration.
 ...
 However, because large parts of Tempest are self verifying there might be uncaught issues running on Python 3.4

The correct should be
 - Tempest should be self-testing.
 ...
 The etc/tempest.conf.sample attempts to be a self-documenting version of the configuration.
 ...
 However, because large parts of Tempest are self-verifying there might be uncaught issues running on Python 3.4

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/215427
Committed: https://git.openstack.org/cgit/openstack/tempest/commit/?id=c53e4e1286eaac3835dd4680507eedd17db72f38
Submitter: Jenkins
Branch: master

commit c53e4e1286eaac3835dd4680507eedd17db72f38
Author: zhangfeng <email address hidden>
Date: Fri Aug 21 04:09:08 2015 +0000

    Fix misspelling in the "README.rst"

    Change the description to
    1."- Tempest should be self-testing."
    2."The etc/tempest.conf.sample attempts to be a
     self-documenting version of the configuration."
    3."However, because large parts of Tempest
      are self-verifying there might be uncaught
      issues running on Python 3.4"

    Closes-Bug: #1486904

    Change-Id: Ic5a5446f62a3bfa7befb5ca9acbb577446faaba4