adding block notation on ArrowNames (#462)

libs/core/shims.d.ts

@@ -773,13 +773,15 @@ declare namespace serial {
     /**
      * Sends a buffer through Serial connection
      */
+    //% blockId=serial_writebuffer block="serial|write buffer %buffer"
     //% help=serial/write-buffer advanced=true weight=6 shim=serial::writeBuffer
     function writeBuffer(buffer: Buffer): void;
 
     /**
-     * Reads multiple characters from the rxBuff and fills a user buffer.
+     * Reads multiple characters from the receive buffer and fills a user buffer.
      * @param length default buffer length, eg: 64
      */
+    //% blockId=serial_readbuffer block="serial|read buffer %length"
     //% help=serial/read-buffer advanced=true weight=5 shim=serial::readBuffer
     function readBuffer(length: number): Buffer;