corrected required to be bool instead of list

cloud/amazon/ec2_vpc_vgw.py

@@ -35,15 +35,11 @@ options:
   name:
     description:
         - name of the vgw to be created or deleted
-    required:
+    required: false
-        - true when combined with a state of 'present'
-        - false when combined with a state of 'absent'
   type:
     description:
         - type of the virtual gateway to be created
-    required:
+    required: false
-        - true when combined with a state of 'present'
-        - false when combined with a state of 'absent'
   vpn_gateway_id:
     description:
         - vpn gateway id of an existing virtual gateway