Convert all comments into "doxygen-ready" comments.

Bug: 36453077
Test: make
Change-Id: Ic77394d4d2e1ccedba3a28230d870c5d6108bd40
diff --git a/bluetooth/1.0/IBluetoothHciCallbacks.hal b/bluetooth/1.0/IBluetoothHciCallbacks.hal
index 15db1ce..b22fa34 100644
--- a/bluetooth/1.0/IBluetoothHciCallbacks.hal
+++ b/bluetooth/1.0/IBluetoothHciCallbacks.hal
@@ -16,7 +16,7 @@
 
 package android.hardware.bluetooth@1.0;
 
-/* The interface from the Bluetooth Controller to the stack. */
+/** The interface from the Bluetooth Controller to the stack. */
 interface IBluetoothHciCallbacks {
     /**
      * Invoked when the Bluetooth controller initialization has been