drm/amd/display: fix comment typo

Spell "transmission" properly.

Found by searching for keyword "tranm".
Signed-off-by: Yueh-Shun Li <shamrocklee@posteo.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_stream_encoder.c

@@ -154,7 +154,7 @@ static void dcn31_hpo_dp_stream_enc_dp_blank(
 			VID_STREAM_STATUS, 0,
 			10, 5000);
 
-	/* Disable SDP tranmission */
+	/* Disable SDP transmission */
 	REG_UPDATE(DP_SYM32_ENC_SDP_CONTROL,
 			SDP_STREAM_ENABLE, 0);