Replace parentheses with curly braces to fix vector doc bug.

https://code.google.com/p/android/issues/detail?id=178299

This change fixes the issue in our spec file, while I already have
checked in the resulting document for frameworks/base.

Change-Id: I3de365e19c4e6b6654fa1ea27d36e6229f055e4e
2 files changed