[re2oapi] Improve documentation.

lookup_plugins/re2oapi.py

@@ -21,10 +21,20 @@ sys.path.append('./lookup_plugins/')
 from re2oapi import Re2oAPIClient
 
 
-
 class LookupModule(LookupBase):
     """
-    If terms = dnszones then this module queries the re2o api and returns the list of all dns zones
+    If terms = dnszones then this module queries the re2o api and returns the list of all dns zones.
+
+
+    Usage:
+
+    The following play will use the debug module to output all the zone names managed by crans.
+
+    - hosts: sputnik.adm.crans.org
+      vars:
+        dnszones: "{{ lookup('re2oapi', 'dnszones', api_hostname='intranet.crans.org') }}"
+      tasks:
+        - debug: var=dnszones
     """