docs: Fix typo "If an activity [is] in the foreground"
docs: Fix typo "If an activity [is] in the foreground"

At http://developer.android.com/reference/android/app/Activity.html#ActivityLifecycle

bug: https://code.google.com/p/android/issues/detail?id=4066
Change-Id: If712144a4005b6f53832316aa55dc0744fa36c4b

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