Rephrases documentation

docs/html/development/getting-started.rst

@@ -49,18 +49,17 @@ pip's tests are written using the :pypi:`pytest` test framework, :pypi:`mock`
 and :pypi:`pretend`. :pypi:`tox` is used to automate the setup and execution of
 pip's tests.
 
+It is preferable to run the tests in parallel for better experience during development,
+since the tests can take a long time to finish when run sequentially.
 To run tests locally, run:
-
 .. code-block:: console
 
-    $ tox -e py36
-
-Generally, it can take a long time to run pip's test suite. To run tests in parallel,
-which is faster, run:
+    $ tox -e py36 -- -n auto
 
+For running tests sequentially remove the ``-n`` flag.
 .. code-block:: console
 
-    $ tox -e py36 -- -n auto
+    $ tox -e py36
 
 The example above runs tests against Python 3.6. You can also use other
 versions like ``py27`` and ``pypy3``.

news/7683.doc

@@ -0,0 +1 @@
+Rephrases test execution command