added code-blocks according to #78963 (#78969)

* added code-blocks according to  #78963
* Update testing.rst, added newlines

docs/docsite/rst/dev_guide/testing.rst

@@ -129,7 +129,9 @@ Create a fresh area to work:
    git clone https://github.com/ansible/ansible.git ansible-pr-testing
    cd ansible-pr-testing
 
-Next, find the pull request you'd like to test and make note of its number. It will look something like this::
+Next, find the pull request you'd like to test and make note of its number. It will look something like this:
+
+.. code-block:: text
 
    Use os.path.sep instead of hardcoding / #65381
 
@@ -204,7 +206,9 @@ More information: :ref:`testing_integration`
 
 Any potential issues should be added as comments on the pull request (and it's acceptable to comment if the feature works as well), remembering to include the output of ``ansible --version``
 
-Example::
+Example:
+
+.. code-block:: text
 
    Works for me! Tested on `Ansible 2.3.0`.  I verified this on CentOS 6.5 and also Ubuntu 14.04.