Update object.md

docs/object.md

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 ### Object
 
 Object is the root class of every object inside Gravity. Through the Object class, objects inherit a basic interface to the runtime system and the ability to behave as Gravity objects.
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+All the built-in Gravity type are built from the base Object class and when you declare a new Class in Gravity without a super class then it is set by default to Object.
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+The new [Introspection](introspection.md) feature is built on top of the base Object class (so any other Class automatically inherits that feature).