link the respective guides in the use-cases and capabilities

[jkowalleck]

The use-cases have short introductions to features and capabilities.
The guides give deeper insights.

The "use-cases" documents are often used as a quick start, that make people want to learn the details.
The "capabilities" documents are often used as a quick start, that make people want to learn the details.
To help people transition from entry levels to mature levels, the guide should be linked in the use-cases.

For example https://cyclonedx.org/use-cases/#properties--name-value-store
could link to https://cyclonedx.org/guides/sbom/extensibility/#cyclonedx-properties and others.

[jkowalleck]

i plan on pushing a draft soon