Bug missing externalDocs url in specification/storageimportexport/resource-manager/Microsoft.ImportExport/stable/2016-11-01/storageimportexport.json

Like noted below, this apparently is required for the schema

```json
{
"resource": "/Users/nschonni/Documents/github/azure-rest-api-specs/specification/storageimportexport/resource-manager/Microsoft.ImportExport/stable/2016-11-01/storageimportexport.json",
"owner": "_generated_diagnostic_collection_name_#1",
"severity": 4,
"message": "String is not a URI: URI expected.",
"startLineNumber": 48,
"startColumn": 28,
"endLineNumber": 48,
"endColumn": 30
}
```

Open specification/storageimportexport/resource-manager/Microsoft.ImportExport/stable/2016-11-01/storageimportexport.json and inspect line 48 around the missing externalDocs URL. Determine the valid URI required by the schema, then verify that the schema diagnostic no longer reports the URI error.

Written by the indexing model from the issue text.