ContainerInstance.json - ContainersGroups_Get has model validation errors

Model validation issues from ContainerInstance - ContainersGroups_Get operation: https://github.com/Azure/azure-rest-api-specs/blob/master/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/preview/2017-08-01-preview/containerInstance.json

1. Required property missing "type" for "ipAddress" [here](https://github.com/Azure/azure-rest-api-specs/blob/76a23e2c89db93576344e9c677bf1cccf98af559/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/preview/2017-08-01-preview/examples/ContainerGroupsGet.json#L51), spec indicates it's required [here](https://github.com/Azure/azure-rest-api-specs/blob/76a23e2c89db93576344e9c677bf1cccf98af559/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/preview/2017-08-01-preview/containerInstance.json#L703)

2. Required property missing due to casing mismatch between spec and example - please double check with one is correct and update accordingly: required property in spec "memoryInGB" [here](https://github.com/Azure/azure-rest-api-specs/blob/76a23e2c89db93576344e9c677bf1cccf98af559/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/preview/2017-08-01-preview/containerInstance.json#L4700) , example [here](https://github.com/Azure/azure-rest-api-specs/blob/76a23e2c89db93576344e9c677bf1cccf98af559/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/preview/2017-08-01-preview/examples/ContainerGroupsGet.json#L31) casing of GB is different.

3. resourceGroup in example but not in spec, example [here](https://github.com/Azure/azure-rest-api-specs/blob/76a23e2c89db93576344e9c677bf1cccf98af559/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/preview/2017-08-01-preview/examples/ContainerGroupsGet.json#L76), spec [definition](https://github.com/Azure/azure-rest-api-specs/blob/76a23e2c89db93576344e9c677bf1cccf98af559/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/preview/2017-08-01-preview/containerInstance.json#L568) for "ContainerGroup" does not contain resourceGroup property

4. containerGroupName missing from required parameters in [example](https://github.com/Azure/azure-rest-api-specs/blob/76a23e2c89db93576344e9c677bf1cccf98af559/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/preview/2017-08-01-preview/examples/ContainerGroupsGet.json#L2), though it's included as a "path" parameter in [spec](https://github.com/Azure/azure-rest-api-specs/blob/76a23e2c89db93576344e9c677bf1cccf98af559/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/preview/2017-08-01-preview/containerInstance.json#L170)

Read specification/containerinstance/resource-manager/Microsoft.ContainerInstance/preview/2017-08-01-preview/containerInstance.json alongside examples/ContainerGroupsGet.json, focusing on the linked definitions and operation parameters. Run the repository's model validation for this operation, then reconcile the four reported discrepancies so the example and specification validate consistently.

Written by the indexing model from the issue text.