Sample policy for fleet provisioning example is wrong

[Th3G4mbl3r]

Confirm by changing [ ] to [x] below to ensure that it's a bug:

• I've searched for previous similar issues and didn't find any solution

Describe the bug
The policy documented as sample policy in README.MD for fleet provisioning sample is wrong. For the subscribe policy it should be topicfilter and not topic.

Expected behavior
The correct policy should be as follows:

{
  "Version": "2012-10-17",
  "Statement": [
    {
        "Effect": "Allow",
        "Action": [
            "iot:Connect"
        ],
        "Resource": "arn:aws:iot:us-west-2:478068371121:client/*"
    },
    {
        "Effect": "Allow",
        "Action": [
            "iot:Receive"
        ],
        "Resource": [
            "arn:aws:iot:us-west-2:478068371121:topic/$aws/certificates/create/*",
            "arn:aws:iot:us-west-2:478068371121:topic/$aws/certificates/create-from-csr/*",
            "arn:aws:iot:us-west-2:478068371121:topic/$aws/provisioning-templates/mb3-sensor-fleet-provision-template/provision/*"
        ]
    },
    {
        "Effect": "Allow",
        "Action": "iot:Publish",
        "Resource": [
            "arn:aws:iot:us-west-2:478068371121:topic/$aws/certificates/create/*",
            "arn:aws:iot:us-west-2:478068371121:topic/$aws/certificates/create-from-csr/*",
            "arn:aws:iot:us-west-2:478068371121:topic/$aws/provisioning-templates/mb3-sensor-fleet-provision-template/provision/*"
        ]
    },
    {
        "Effect": "Allow",
        "Action": ["iot:Subscribe"],
        "Resource": [
            "arn:aws:iot:us-west-2:478068371121:topicfilter/$aws/certificates/create/*",
            "arn:aws:iot:us-west-2:478068371121:topicfilter/$aws/certificates/create-from-csr/*",
            "arn:aws:iot:us-west-2:478068371121:topicfilter/$aws/provisioning-templates/mb3-sensor-fleet-provision-template/provision/*"
        ]
    }
  ]
}

[bretambrose]

#82