codec_descriptors: fix typo in mpeg 2 video

Found-by: Ramiro
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/codec_desc.c

@@ -39,7 +39,7 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .id        = AV_CODEC_ID_MPEG2VIDEO,
         .type      = AVMEDIA_TYPE_VIDEO,
         .name      = "mpeg2video",
-        .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
+        .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
         .props     = AV_CODEC_PROP_LOSSY,
     },
     {