Adding a basic computed property to the object example that demonstrates how to get validation of non-model property via js.

Resolves # .

I was looking at documentation in Usage/Basic and could not find an example of how to access a component property's validation. Found example in Validations/Accessing Validations.

Changes proposed:

• Adding Example of getting validation of a property in component to the existing documentation.

Tasks:

• Added test case(s) - not applicable due to it just being a documentation update
• Updated documentation