Fix enableDebugTools import path

[ulikoehler]

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• Tests for the changes have been added (for bug fixes / features)
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What kind of change does this PR introduce? (check one with "x")

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Other... Please describe:

Currently the JS tools example imports enableDebugTools from angular2/platform/browser. However, the package name has been changed, so enableDebugTools needs to be imported from @angular/platform-browser. I checked the new import path with 2.0.0-rc2 and can provide a Plunk if required.

There are no breaking changes as this is a doc-only fix.

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[ulikoehler]

I signed it!

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[vicb]

The commit message follows our guidelines

Nope, I'll update before merging. Thanks for the PR.

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