docs($controller): fix missing ")"

[gressus]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  docs update
• What is the current behavior? (You can also link to an open issue here)
  misspelling
• What is the new behavior (if this is a feature change)?
• Does this PR introduce a breaking change?
• Please check if the PR fulfills these requirements
• The commit message follows our guidelines: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit-message-format
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Other information:

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[googlebot]

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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[gkalpak]

(Accidentally) merged and backported to v1.5.x (ad15db8) and v1.4.x (146f9c1), without noticing the CLA is not signed.
@gressus, could you please sign the CLA now ?