Support linking to built-in types, all lowercase

[OmgImAlexis]

Currently I have to use Object over object as docma doesn't link to MDN for the lowercase version.

object	Object

See gajus/eslint-plugin-jsdoc#25 (comment)

[onury]

I'm not sure about this. Javascript has no type called object.
(Don't confuse typeof x === 'object' meta comparison with Object.)

What if you use object as a type definition in your code?