MdDialog documentation is incomplete

[moui72]

Bug, feature request, or proposal:

docs bug

What is the expected behavior?

a complete example

What is the current behavior?

the example does not show the HTML for the dialog itself ... it took a moment to figure out that the buttons needed (click)="dialogRef.close('Option 2')" rather than just click="close('Option 2')" without that file being part of the example.

[andrewseguin]

Duplicate of #2934

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