docs: fix hdef variable
docs: fix hdef variable

Change-Id: I737258d454f426506e529e3d48fefb1397b9e8d3

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