Add documentation to setup.py and remove use of $params.fact_path in setup.ps1

lib/ansible/modules/system/setup.py

@@ -54,12 +54,14 @@ notes:
       install I(facter) and I(ohai) means you can avoid Ruby-dependencies on your
       remote systems. (See also M(facter) and M(ohai).)
     - The filter option filters only the first level subkey below ansible_facts.
-    - If the target host is Windows, you will not currently have the ability to use
-      C(fact_path) or C(filter) as this is provided by a simpler implementation of the module.
-      Different facts are returned for Windows hosts.
+    - If the target host is Windows you can now use C(fact_path). Make sure that this path 
+      exists on the target host. Files in this path MUST be PowerShell scripts (*.ps1) and 
+      their output must be formattable in JSON (Ansible will take care of this). Test the 
+      output of your scripts.
 author:
     - "Ansible Core Team"
     - "Michael DeHaan"
+    - "David O'Brien @david_obrien davidobrien1985"
 '''
 
 EXAMPLES = """
@@ -74,6 +76,9 @@ ansible all -m setup -a 'filter=facter_*'
 
 # Display only facts about certain interfaces.
 ansible all -m setup -a 'filter=ansible_eth[0-2]'
+
+# Display facts from Windows hosts with custom facts stored in C(C:\\custom_facts).
+ansible windows -m setup -a "fact_path='c:\\custom_facts'"
 """