staging: rtl8723bs: Improve clarity of MAR usage

This patch improves the readability of the code related to the Multicast
Address Register (REG_MAR) in the rtl8723bs driver. It adds comments to
clarify the purpose and offset of the register, making the code more
self-documenting without introducing new macros.
Signed-off-by: Manjae Cho <manjae.cho@samsung.com>
Reviewed-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/20240731225134.917542-1-manjae.cho@samsung.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/hal/sdio_halinit.c

@@ -380,8 +380,8 @@ static void _InitWMACSetting(struct adapter *padapter)
 	rtw_write32(padapter, REG_RCR, pHalData->ReceiveConfig);
 
 	/*  Accept all multicast address */
-	rtw_write32(padapter, REG_MAR, 0xFFFFFFFF);
-	rtw_write32(padapter, REG_MAR + 4, 0xFFFFFFFF);
+	rtw_write32(padapter, REG_MAR, 0xFFFFFFFF);	/* Offset 0x0620-0x0623 */
+	rtw_write32(padapter, REG_MAR + 4, 0xFFFFFFFF);	/* Offset 0x0624-0x0627 */
 
 	/*  Accept all data frames */
 	value16 = 0xFFFF;