Add JSON-LD context and validation info to Serialization chapter

[bact]

Use info from

• https://github.com/spdx/spdx-3-model/blob/main/serialization/README.md
• https://github.com/spdx/spdx-3-model/blob/main/serialization/jsonld.md

This will resolve #998

Please also check the 3 URLs used in the content if they are the preferred location:

1. JSON context: https://spdx.org/rdf/3.0.1/spdx-context.jsonld
2. OWL ontology: https://spdx.org/rdf/3.0.1/spdx-model.ttl
3. JSON Schema: https://spdx.org/schema/3.0.1/spdx-json-schema.json

---

Note: Those 3.0.1 URLs are based on 3.0.0 URLs:

1. JSON context: https://spdx.org/rdf/3.0.1/spdx-context.jsonld
   • Based on this 3.0 URL:

   • spdx-spec/examples/jsonld/package_sbom.json

     Line 2 in b2f7464

     "@context": "https://spdx.org/rdf/3.0.0/spdx-context.jsonld",

   • spdx-spec/bin/check-examples.sh

     Line 60 in b2f7464

     "@context": "https://spdx.org/rdf/3.0.0/spdx-context.jsonld",

   • Already used here:

   • spdx-spec/docs/annexes/rdf-model.md

     Line 7 in b2f7464

     [SPDX 3.0.1 Model](https://spdx.org/rdf/3.0.1/spdx-model.ttl)

2. OWL ontology: https://spdx.org/rdf/3.0.1/spdx-model.ttl
   • Based on this 3.0.0 URL:

   • spdx-spec/bin/check-examples.sh

     Lines 20 to 22 in b2f7464

     	pyshacl \
     	-s https://spdx.org/rdf/3.0.0/spdx-model.ttl \
     	-e https://spdx.org/rdf/3.0.0/spdx-model.ttl \

3. JSON Schema: https://spdx.org/schema/3.0.1/spdx-json-schema.json
   • Based on this 3.0.0 URL:

   • spdx-spec/bin/check-examples.sh

     Lines 15 to 17 in b2f7464

     	check-jsonschema \
     	-v \
     	--schemafile https://spdx.org/schema/3.0.0/spdx-json-schema.json \

[goneall]

Overall, looks good - one minor suggestion on use of caps, but I'll approve. If @zvr and/or @kestewart approve of the current state, please feel free to merge.

I'll need to add the context, ontology, and schema to the spdx.org website for the links in this PR to be live.

[bobmartin3000]

LGTM

[bact]

I'll need to add the context, ontology, and schema to the spdx.org website for the links in this PR to be live.

Keep track with #1060