missing docs for rule 1047 XmsEnumChanged

从缺失的 docs/rules/1047.md 页面和 issue 中的规则输出开始，特别关注代码 XmsEnumChanged 及其消息。完成的标准是该路径下存在规则文档，并且报告的 docUrl 不再返回 404。

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

  {
    "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"
  },