feat(docs): Use $scope instead of scope

[miensol]

To avoid confusion it would be good to keep the examples consistent.
While scope in DialogController will be the same as $scope it brings confusion to a reader.
I can only guess that scope here working is by accident - caused by

material/src/core/services/interimElement/interimElement.js

Line 353 in 786b0ed

angular.extend(compileData.locals, self.options);

.

The fix also includes missing } mentioned here: #2788

Here's a working pen: http://codepen.io/anon/pen/ZGWOpZ.

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[miensol]

I signed it!

[googlebot]

CLAs look good, thanks!

[gkalpak]

The example does not work anyway. There are several issues that need to be fixed.

BTW, @ThomasBurleson, the examples in the Services section seem to be derived from comments. As a result they are not editable in CodePen and (most importantly) they are not run in tests (which may result in incorrect/outdated code => confusion).
Something should probably be done about it :)

[ThomasBurleson]

@gkalpak - #2869

[gkalpak]

👍 @ThomasBurleson