MIDI docs: fix buffer allocation
MIDI docs: fix buffer allocation

Also describe NoteOn more clearly.

Bug: 23303608
Change-Id: I35f88022c854c2eb16ec606e58f28e06c52d18b7
Signed-off-by: Phil Burk <c76ad1a5417d5e5ec6068289c7ca2032944e4216@google.com>
(cherry picked from commit bda0caf07b786633381a029f782b9d2e1caa8a3f)

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