Don't add remarks sections to enum fields

[gewarren]

Remarks for enum fields are invalid (there's nowhere to display them in docs and they now cause a build warning). Please update the tool to not add empty remarks nodes for enum fields.

[carlossanlop]

@gewarren do you know why Enum fields do not show remarks? I can fix the tool, it's no problem, but maybe we should request this feature to the Docs dev team.

[gewarren]

@tannergooding would also like a way to show enum remarks (and applicable versions). So it is probably worth opening a request. See dotnet/dotnet-api-docs#5201 (comment).

[gewarren]

Here's the internal work item regarding enum fields having their own pages in API docs: https://ceapex.visualstudio.com/Engineering/_workitems/edit/390259

[gewarren]

Closing this issue since it will be fixed on the docs side.