Port ansible doc for plugins to use DOCUMENTATION variables

* Using docstrings conflicts with the standard use of docstrings
* PYTHON_OPTIMIZE=2 will omit docstrings.  Using docstrings makes future
  changes to the plugin and module code subject to the requirement that we
  ensure it won't be run with optimization.

lib/ansible/plugins/callback/profile_tasks.py

@@ -5,8 +5,11 @@
 # (C) 2017 Ansible Project
 # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
-'''
-DOCUMENTATION:
+# Make coding more python3-ish
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+DOCUMENTATION = '''
     callback: profile_tasks
     type: aggregate
     short_description: adds time information to tasks
@@ -38,7 +41,9 @@ DOCUMENTATION:
         ini:
           - section: callback_profile_tasks
             key: sort_order
-#EXAMPLES: > '
+'''
+
+EXAMPLES = '''
 #
 #    TASK: [ensure messaging security group exists] ********************************
 #    Thursday 11 June 2017  22:50:53 +0100 (0:00:00.721)       0:00:05.322 *********
@@ -50,11 +55,6 @@ DOCUMENTATION:
 #  '
 '''
 
-# Make coding more python3-ish
-# Make coding more python3-ish
-from __future__ import (absolute_import, division, print_function)
-__metaclass__ = type
-
 import collections
 import time