Maybe should change the Math class name

[YaoKaiLun]

Math is a standard built-in object, Maybe should change the Math component class name
https://github.com/dolanmiu/docx/blob/master/src/file/paragraph/math/math.ts

[dolanmiu]

So is Document

Unfortunately, there will be clashes. We can't account for all of them

Correctly namespace, and it will all be fine