Refactoring text on ownership, copyright, access rights

[egekorkan]

While we mention it in multiple places, it should be clear that a binding can be paywalled, implementation restricted (or certification required) etc.

• https://w3c.github.io/wot-binding-registry/#req-copy
• https://w3c.github.io/wot-binding-registry/#req-openread
• Also see Note under https://github.com/matter-js/matter.js?tab=readme-ov-file#what-is-matterjs for an example for Matter from CSA.

Thus, we should refactor the document to bundle this information in one place.