dnsconfig: Add 'action: member' to dnsconfig example playbooks.

As of verison 1.6.1 of ansible-freeipa, ipadnsconfig supports
'action: member' to manage DNS forwardes, and requires the use of this
action if 'state: present'.

This patch fixes the playbook examples.

playbooks/dnsconfig/forwarders-absent.yml

@@ -4,10 +4,11 @@
   become: true
 
   tasks:
-  - name: Set dnsconfig.
+  - name: Set dnsconfig forwarders.
     ipadnsconfig:
       forwarders:
         - ip_address: 8.8.4.4
         - ip_address: 2001:4860:4860::8888
           port: 53
+      action: member
       state: absent

playbooks/dnsconfig/forwarders-present.yml

+---
+- name: Playbook to handle global DNS configuration
+  hosts: ipaserver
+  become: true
+
+  tasks:
+  - name: Set dnsconfig forwarders.
+    ipadnsconfig:
+      forwarders:
+        - ip_address: 8.8.4.4
+        - ip_address: 2001:4860:4860::8888
+          port: 53
+      action: member