Broken Return type link for service_context

[dumbledad]

On the SDK page for Workspace Class here, the return type for service_context renders as <xref:azureml._restclient.service_context.ServiceContext> rather than as a link to the ServiceContext class documentation.

(N.B. This seems like the wrong issues list to add this to, but it is the one linked to by View all page feedback at the bottom of the page.)