hls: use a meaningful long name

libavformat/hlsenc.c

@@ -312,7 +312,7 @@ static const AVClass hls_class = {
 
 AVOutputFormat ff_hls_muxer = {
     .name           = "hls",
-    .long_name      = NULL_IF_CONFIG_SMALL("hls"),
+    .long_name      = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
     .extensions     = "m3u8",
     .priv_data_size = sizeof(HLSContext),
     .audio_codec    = AV_CODEC_ID_MP2,