message: update the codec comment
diff: @@ -10,7 +10,7 @@ use crate::core::Encoder as FluvioEncoder;
  use crate::core::bytes::{Bytes, BytesMut, BufMut};
  use crate::core::Version;
  -/// Implement Kafka codec as in https://kafka.apache.org/protocol#The_Messages_ListOffsets
  +/// Implement Fluvio Encoding
  /// First 4 bytes are size of the message. Then total buffer = 4 + message content
  ///
  #[derive(Debug, Default)]
  @@ -71,7 +71,7 @@ impl Decoder for FluvioCodec {
  }
  }
  -/// Implement encoder for Kafka Codec
  +/// Implement encoder for Fluvio Codec
  /// This is straight pass thru, actual encoding is done file slice
  impl Encoder<Bytes> for FluvioCodec {
  type Error = IoError;
  @@ -83,7 +83,7 @@ impl Encoder<Bytes> for FluvioCodec {
  }
  }
  -/// Implement encoder for Kafka Codec
  +/// Implement encoder for Fluvio Codec
  impl<T: FluvioEncoder> Encoder<FluvioCodecData<T>> for FluvioCodec {
  type Error = IoError;
  