Add docs for encrypted_databag

Author: fpedrini

chef/api.py

@@ -50,6 +50,10 @@ class ChefAPI(object):
 
             with ChefAPI('http://localhost:4000', 'client.pem', 'admin'):
                 n = Node('web1')
+
+        In order to use :class:`EncryptedDataBagItem` object it is necessary
+        to specify either a path to a file containing the Chef secret key and
+        the Encrypted Databag version to be used (v1 by default)
     """
 
     ruby_value_re = re.compile(r'#\{([^}]+)\}')

chef/encrypted_data_bag_item.py

@@ -16,6 +16,14 @@
 
 
 class EncryptedDataBagItem(DataBagItem):
+    """An Encrypted Chef data bag item object.
+
+    Encrypted Databag Items behave in the same way as :class:`DatabagItem`
+    except the keys and values are encrypted as detailed in the Chef docs:
+    https://docs.chef.io/data_bags.html#encrypt-a-data-bag-item
+
+    Refer to the :class:`DatabagItem` documentation for usage.
+    """
     SUPPORTED_ENCRYPTION_VERSIONS = (1,2)
     AES_MODE = 'aes_256_cbc'