MINOR: htx: Don't use end-of-data blocks anymore

This type of blocks is useless because transition between data and trailers is
obvious. And when there is no trailers, the end-of-message is still there to
know when data end for chunked messages.
diff --git a/contrib/prometheus-exporter/service-prometheus.c b/contrib/prometheus-exporter/service-prometheus.c
index 483e703..c552337 100644
--- a/contrib/prometheus-exporter/service-prometheus.c
+++ b/contrib/prometheus-exporter/service-prometheus.c
@@ -2186,7 +2186,7 @@
 			/* fall through */
 
 		case PROMEX_ST_DONE:
-			/* Don't add EOD and TLR because mux-h1 will take care of it */
+			/* Don't add TLR because mux-h1 will take care of it */
 			if (!htx_add_endof(res_htx, HTX_BLK_EOM)) {
 				si_rx_room_blk(si);
 				goto out;