docs(ngmodule): swapped is swapped

[Dani723]

We swapped the BrowserModule for CommonModule?

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Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[Dani723]

I signed it!

[googlebot]

CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!

[wardbell]

Thanks. Both equally unclear. Fixed. Merged