Fix docs issues in aws_s3_bucket_info and ec2_vpc_vpn (ansible-collec…

…tions#47)

* Make sure that example string is parsed as string and not as datetime.

* Make sure that expression is treated as string.

This is probably not the correct value either, but at least it doesn't cause ansible-doc --json to crash.

This commit was initially merged in https://github.com/ansible-collections/community.aws
See: ansible-collections/community.aws@a66b5ee

plugins/modules/ec2_vpc_vpn.py

@@ -288,7 +288,7 @@
     vgw_telemetry: [{
                      'outside_ip_address': 'string',
                      'status': 'up',
-                     'last_status_change': datetime(2015, 1, 1),
+                     'last_status_change': 'datetime(2015, 1, 1)',
                      'status_message': 'string',
                      'accepted_route_count': 123
                     }]