AudioMetadata: Add documentation

Update comments only for IStreamOutEventCallback::onCodecFormatChanged

Test: compiles, this is a comment change only.
Bug: 150175043
Change-Id: I1895c737997fbf3cb509b4078b545658d11df198
diff --git a/current.txt b/current.txt
index d2b7206..edf96b2 100644
--- a/current.txt
+++ b/current.txt
@@ -619,6 +619,7 @@
 164826a380f4c1700183003f62d7532e367b67381c30ea44f946c0cf00008f85 android.hardware.audio@6.0::IStreamOut
 997fdaad7a9d17ee7e01feb7031a753e2365e72ad30b11d950e9183fabdf3844 android.hardware.audio@6.0::IStreamOutCallback
 e7ca0db9a1098210f327a9b152fa6afe6bf019c41e5264c64829d04d50c0a526 android.hardware.audio@6.0::IStreamOutEventCallback
+aa2211abd803e03d05ea11c18749db068f785fe026f8d99bce64bd764f63d194 android.hardware.audio@6.0::IStreamOutEventCallback  # b/150175043
 822369cf4dc16a6f6b9622bcf86cbdc0b692dc82193fc15e967767175cbfdd8f android.hardware.audio@6.0::types
 bee662c62d997d8065e2bcb5c1e7a9578931f22ce28fd02c219fdb4d0630abf7 android.hardware.audio.common@6.0::types
 525bec6b44f1103869c269a128d51b8dccd73af5340ba863c8886c68357c7faf android.hardware.audio.effect@6.0::IAcousticEchoCancelerEffect