Dialog example should include code from dialog-result-example-dialog.html

[jrood]

The overview for the Dialog talks about using elements such as <md-dialog-content> and <md-dialog-actions>. However, no examples of actual code using these elements is visible, because that code would be in the dialog-result-example-dialog.html file (referenced in the .ts files in both the overview and the example), but the actual content of that html file is not visible anywhere.

[jrood]

Also, it's not clear whether DialogResultExampleDialog needs to be an entry component or how it might need to be referenced in the app.module.ts. (I'm willing to make a second issue for this if anyone thinks that is necessary.)

[jelbourn]

Tracking via #165