5.x Review and update examples

[markstory]

With the Cake 5 out, we should review the getting started tutorials, ORM examples and update them so that users don't hit deprecations when copy pasting code out of the docs.

Examples that likely need attention:

• Entity class definitions
• Table class definitions
• ORM query building find() and friends.

[github-actions]

This issue is stale because it has been open for 120 days with no activity. Remove the stale label or comment or this will be closed in 15 days

[github-actions]

This issue is stale because it has been open for 120 days with no activity. Remove the stale label or comment or this will be closed in 15 days