Issue Description: <{}This is the problem you are trying to solve. Please use instructions of how to recreate the issue and screenshots to help>{}

Review and update docs related to recent Rule Unit API changes.

• Getting Started (including archetype)
• Engine dependency
• Rule Unit API
• Rule Unit DSL
• Rule Unit in DRL
  • https://github.com/kiegroup/drools/pull/4691#discussion_r971740445
• Migration guide
• more?

Acceptance Criteria: <Use this section to define the definition of done for this issue>

• Align with the changes introduced by linked JIRAs

Out of Scope: <Here you need to fill in what is out of scope for this issue and then create new issues if necessary in the backlog for the work>

N/A

Additional Information: <Add any additional information here that may be helpful to people reading the ticket>

N/A