missing docs for rule 1047 XmsEnumChanged

`docUrl` of https://github.com/Azure/openapi-diff/tree/master/docs/rules/1047.md ends up as 404 File not found.

``` json
{
"id": "1047",
"code": "XmsEnumChanged",
"message": "The new version has a different x-ms-enum 'name' than the previous one.",
"old": {
"ref": "file:///C:/Users/cataggar/ms/azure-rest-api-specs-pr/specification/vmware/resource-manager/Microsoft.AVS/stable/2023-03-01/vmware.json#/definitions/VirtualMachineRestrictMovement/properties/restrictMovement",
"path": "definitions.VirtualMachineRestrictMovement.properties.restrictMovement",
"location": "file:///C:/Users/cataggar/ms/azure-rest-api-specs-pr/specification/vmware/resource-manager/Microsoft.AVS/stable/2023-03-01/vmware.json:7571:9"
},
"new": {
"ref": "file:///C:/Users/cataggar/ms/azure-rest-api-specs-pr/specification/vmware/resource-manager/Microsoft.AVS/preview/2023-09-01-preview/vmware.json#/definitions/VirtualMachineRestrictMovement/properties/restrictMovement",
"path": "definitions.VirtualMachineRestrictMovement.properties.restrictMovement",
"location": "file:///C:/Users/cataggar/ms/azure-rest-api-specs-pr/specification/vmware/resource-manager/Microsoft.AVS/preview/2023-09-01-preview/vmware.json:9503:9"
},
"type": "Error",
"docUrl": "https://github.com/Azure/openapi-diff/tree/master/docs/rules/1047.md",
"mode": "Update"
},
```

Start with the missing docs/rules/1047.md page and the rule output in the issue, especially code XmsEnumChanged and its message. Done means the rule documentation exists at that path and the reported docUrl no longer returns a 404.

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