[Feature Request] Generate docs ONLY for stuff with the /// comment.

[GarfieldJiang]

Is your feature request related to a problem? Please describe. I want to hide some public APIs in the documentation. I want to include only those with the /// comments.

Describe the solution you'd like Hope filter rules (apiRules in filterConfig.yml) have some option like

- apiRules:
- include:
    uidRegex: ^MyNamespace$
    type: Namespace
- exclude:
    withTripleSlashComment: false

Or options in docfx.json.

Describe alternatives you've considered None.

Additional context None.