Fix tempest doc typos

One sentence was worded better to avoid "with" at the end of the sentence
but kept it a good doc formatted sentence.

There was a wrong word "a" that should have been "are" in one sentence.

Closes-Bug: #2144311
Change-Id: I970629344d824050bc6071a853da04b47aa6819a
Signed-off-by: Jason Paroly <jparoly@redhat.com>
diff --git a/doc/source/configuration.rst b/doc/source/configuration.rst
index c790c5f..c6e6a37 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -35,8 +35,8 @@
 
 Tempest allows for configuring pre-provisioned test credentials as well.
 This can be done using the accounts.yaml file (see
-`Pre-Provisioned Credentials`_). This file is used to specify an arbitrary
-number of users available to run tests with.
+`Pre-Provisioned Credentials`_). This file specifies an arbitrary number
+of users that can be used to run tests.
 You can specify the location of the file in the ``auth`` section in the
 tempest.conf file. To see the specific format used in the file please refer to
 the ``accounts.yaml.sample`` file included in Tempest.
@@ -141,7 +141,7 @@
 
 When the Keystone in the target cloud requires domain scoped tokens to
 perform admin actions, all pre-provisioned admin users must have a role
-assigned on the domain where test accounts a provisioned.
+assigned on the domain where test accounts are provisioned.
 The option ``admin_domain_scope`` is used to tell Tempest that domain scoped
 tokens shall be used. ``default_credentials_domain_name`` is the domain where
 test accounts are expected to be provisioned if no domain is specified.