docs(MdTab): Missing description for input property

[julianobrasil]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

There should be description for all component exposed properties in the docs

What is the current behavior?

MdTab dynamicHeight description is missing:

What are the steps to reproduce?

Just look in the docs: https://material.angular.io/components/tabs/api

What is the use-case or motivation for changing an existing behavior?

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Is there anything else we should know?

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