Root entity in example in data-entities.md is missing the mandatory field "description"

[nimpo]

Describe the bug
6.3 of the specification states that the root entity of an RO Crate MUST (RFC2119) contain all elements: "@⁠type", "@⁠id", "name", "description", "datePublished" "license" [sic]

The example in section 7.4 is missing a "description" element.

URL
https://github.com/ResearchObject/ro-crate/blob/main/docs/_specification/1.2/data-entities.md#example-attached-ro-crate-package

Suggested fix
To the example root entity add

description: "",

Additional context
Description MUST be present, but need not contain any data as this is covered by a SHOULD directive.

[nimpo]

Similarly the RO Crate JSON-LD Appendix (Section 15.1) example is missing entries: "datePublished" and "license", which "MUST" be present. If these are assumed to have a null value when missing and still considered to conform, then the MUST in 6.3 needs to be relaxed.

Later examples in appendix are mitigated with use of well placed ellipses.