Name the fixed audio interrupt buffer size in its V547 reason

src/class/audio/audio_device.c

diff --git a/src/class/audio/audio_device.c b/src/class/audio/audio_device.c
index 1889584..01d1bac 100644
--- a/src/class/audio/audio_device.c
+++ b/src/class/audio/audio_device.c
@@ -558,7 +558,7 @@
   uint8_t size = tud_audio_n_version(func_id) == 2 ? sizeof(audio20_interrupt_data_t) : sizeof(audio10_interrupt_data_t);
 
   // INT EP buffer must be large enough
-  TU_ASSERT(size <= sizeof(int_ep_buf[func_id].buf)); //-V547 buffer sized from the same config value
+  TU_ASSERT(size <= sizeof(int_ep_buf[func_id].buf)); //-V547 buffer is the fixed 6-byte CFG_TUD_AUDIO_INTERRUPT_EP_SZ, the UAC2 message size
 
   // Check length
   if (tu_memcpy_s(int_ep_buf[func_id].buf, sizeof(int_ep_buf[func_id].buf), data, size) == 0) {