Documentatin fixes

changelogs/fragments/drop-python-2.6-controller.yaml

@@ -1,6 +1,6 @@
 ---
 major_changes:
-- Support for running an Ansible controller with Python 2.6 has been dropped.
+- Support for running an Ansible controller with Python-2.6 has been dropped.
   You can still manage machines which use Python-2.6 but you will have to
   manage them from a machine which has Python-2.7 or Python-3.5 or greater
   installed.

docs/docsite/rst/dev_guide/testing_units_modules.rst

@@ -531,7 +531,7 @@ A helpful development approach to this should be to ensure that all of the tests
 run under Python 2.6 and that each assertion in the test cases has been checked to work by breaking
 the code in Ansible to trigger that failure.
 
-.. warn:: Maintain Python-2.6 compatibility
+.. warning:: Maintain Python-2.6 compatibility
 
     Please remember that modules need to maintain compatibility with Python-2.6 so the unittests for
     modules should also be compatible with Python-2.6.

docs/docsite/rst/installation_guide/intro_installation.rst

@@ -41,7 +41,7 @@ information about running from source.  It's not necessary to install the progra
 Control Machine Requirements
 ````````````````````````````
 
-Currently Ansible can be run from any machine with Python 2 (version 2.7) or Python 3 (versions 3.5 and higher) installed (Windows isn't supported for the control machine).
+Currently Ansible can be run from any machine with Python 2 (version 2.7) or Python 3 (versions 3.5 and higher) installed. Windows isn't supported for the control machine.
 
 This includes Red Hat, Debian, CentOS, macOS, any of the BSDs, and so on.