lavc: clarify experimental codec message

Should be easier for new users to get a working output.

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

libavcodec/utils.c

@@ -789,7 +789,7 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVD
 
     if (codec->capabilities & CODEC_CAP_EXPERIMENTAL)
         if (avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
-            av_log(avctx, AV_LOG_ERROR, "Codec is experimental but experimental codecs are not enabled, see -strict -2\n");
+            av_log(avctx, AV_LOG_ERROR, "Codec is experimental but experimental codecs are not enabled, try -strict -2\n");
             ret = -1;
             goto free_and_end;
         }