dataset schema inconsistencies

[JMatej]

Same class of issue as #2690, but for the dataset schema object rather than actor.json top-level fields.

The DatasetSchema object definition table documents only three properties: actorSpecification, fields, and views.

However, examples place title and description directly on the dataset-schema object, as siblings of views:

"dataset": {
    "actorSpecification": 1,
    "title": "Zappos.com Dataset",
    "description": "",
    "views": { ... }
}

Used in examples (here)