The enable parameter is a boolean, then convert to a boolean. (#1607)

At the moment, this only works when 'enable' is equals to 'yes' or 'no'.

While I'm on it, I also fixed a typo in the example and added a required
parameter.

lib/ansible/modules/extras/windows/win_firewall_rule.ps1

@@ -212,6 +212,7 @@ $action=Get-Attr $params "action" "";
 $misArg = ''
 # Check the arguments
 if ($enable -ne $null) {
+    $enable=ConvertTo-Bool $enable;
     if ($enable -eq $true) {
         $fwsettings.Add("Enabled", "yes");
     } elseif ($enable -eq $false) {

lib/ansible/modules/extras/windows/win_firewall_rule.py

@@ -114,10 +114,11 @@ EXAMPLES = '''
   action: win_firewall_rule
   args:
       name: smtp
-      enabled: yes
+      enable: yes
       state: present
       localport: 25
       action: allow
+      direction: In
       protocol: TCP
 
 '''