Migration guide : non executable model to executable model

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

• Add a section for "non executable model to executable model" in Migration Guide chapter
  • Add the suggestion in DROOLS-7198
     

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

• Migration Guide has "non executable model to executable model" section

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> 

• No need to fill the section with all known information. Just start with DROOLS-7198

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

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