Typo in Systrace doc.
Typo in Systrace doc.

Change-Id: Iaeeaebfb324274e87dd8a16935089d131c00c37d

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base