Add a lot of documentation

notice_response.go

@@ -2,12 +2,16 @@ package pgproto3
 
 type NoticeResponse ErrorResponse
 
+// Backend identifies this message as sendable by the PostgreSQL backend.
 func (*NoticeResponse) Backend() {}
 
+// Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message
+// type identifier and 4 byte message length.
 func (dst *NoticeResponse) Decode(src []byte) error {
 	return (*ErrorResponse)(dst).Decode(src)
 }
 
+// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
 func (src *NoticeResponse) Encode(dst []byte) []byte {
 	return append(dst, (*ErrorResponse)(src).marshalBinary('N')...)
 }