bug(docs): md-paginator overview/examples aren't responsive

[rafaelss95]

Bug, feature request, or proposal:

Bug.

What is the expected behavior?

What is the current behavior?

Here's how the layout fits in mobile:

What are the steps to reproduce?

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Plunker template: https://goo.gl/DlHd6U

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?

[andrewseguin]

Fixed in #7610

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