AAudio: doc that 24BIT_PACKED is little-endian

Bug: 190724856
Test: read resulting autodocs
Change-Id: I25e449ee63e419dcc3c7c0084031e3d5b6f0b334
diff --git a/media/libaaudio/include/aaudio/AAudio.h b/media/libaaudio/include/aaudio/AAudio.h
index 6ca5fc8..4b08295 100644
--- a/media/libaaudio/include/aaudio/AAudio.h
+++ b/media/libaaudio/include/aaudio/AAudio.h
@@ -82,7 +82,9 @@
 
     /**
      * This format uses 24-bit samples packed into 3 bytes.
-     * The bytes are in the native endian order.
+     * The bytes are in little-endian order, so the least significant byte
+     * comes first in the byte array.
+     *
      * The maximum range of the data is -8388608 (0x800000)
      * to 8388607 (0x7FFFFF).
      *