codec_desc: provide aliases for PCM A-law/mu-law

Inspired by d21b82fd3a.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/codec_desc.c

@@ -1375,13 +1375,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .id        = AV_CODEC_ID_PCM_MULAW,
         .type      = AVMEDIA_TYPE_AUDIO,
         .name      = "pcm_mulaw",
-        .long_name = NULL_IF_CONFIG_SMALL("PCM mu-law"),
+        .long_name = NULL_IF_CONFIG_SMALL("PCM mu-law / G.711 mu-law"),
     },
     {
         .id        = AV_CODEC_ID_PCM_ALAW,
         .type      = AVMEDIA_TYPE_AUDIO,
         .name      = "pcm_alaw",
-        .long_name = NULL_IF_CONFIG_SMALL("PCM A-law"),
+        .long_name = NULL_IF_CONFIG_SMALL("PCM A-law / G.711 A-law"),
     },
     {
         .id        = AV_CODEC_ID_PCM_S32LE,