Windows: Fix documentation strings to be raw strings (#20301)

* Windows: Fix documentation strings to be raw strings

Especially when using Windows paths they easily get confused as escaped
sequences or unicode characters. So by default use raw strings

This fixes #20295

* Fixed as hinted by @abadger

And some trailing whitespace fixes.

lib/ansible/modules/windows/win_user.py

@@ -25,7 +25,7 @@ ANSIBLE_METADATA = {'status': ['stableinterface'],
                     'supported_by': 'core',
                     'version': '1.0'}
 
-DOCUMENTATION = '''
+DOCUMENTATION = r'''
 ---
 module: win_user
 version_added: "1.7"
@@ -131,12 +131,12 @@ options:
       - query
     default: present
     aliases: []
-author: 
+author:
     - "Paul Durivage (@angstwad)"
     - "Chris Church (@cchurch)"
 '''
 
-EXAMPLES = '''
+EXAMPLES = r'''
 - name: Ensure user bob is present
   win_user:
     name: bob