Add RETURN docs

lib/ansible/modules/extras/cloud/amazon/ec2_eni.py

@@ -168,6 +168,60 @@ EXAMPLES = '''
 
 '''
 
+
+RETURN = '''
+interface:
+  description: Network interface attributes
+  returned: when state != absent
+  type: dictionary
+  contains:
+    description:
+      description: interface description
+      type: string
+      sample: Firewall network interface
+    groups:
+      description: list of security groups
+      type: list of dictionaries
+      sample: [ { "sg-f8a8a9da": "default" } ]
+    id:
+      description: network interface id
+      type: string
+      sample: "eni-1d889198"
+    mac_address:
+      description: interface's physical address
+      type: string
+      sample: "06:9a:27:6a:6f:99"
+    owner_id:
+      description: aws account id
+      type: string
+      sample: 812381371
+    private_ip_address:
+      description: primary ip address of this interface
+      type: string
+      sample: 10.20.30.40
+    private_ip_addresses:
+      description: list of all private ip addresses associated to this interface
+      type: list of dictionaries
+      sample: [ { "primary_address": true, "private_ip_address": "10.20.30.40" } ]
+    source_dest_check:
+      description: value of source/dest check flag
+      type: boolean
+      sample: True
+    status:
+      description: network interface status
+      type: string
+      sample: "pending"
+    subnet_id:
+      description: which vpc subnet the interface is bound
+      type: string
+      sample: subnet-b0a0393c
+    vpc_id:
+      description: which vpc this network interface is bound
+      type: string
+      sample: vpc-9a9a9da
+
+'''
+
 import time
 import re