updated docs paths

libs/microbit/serial.ts

@@ -4,7 +4,7 @@ namespace serial {
      * Prints a line of text to the serial
      * @param value to send over serial
      */
-    //% blockId=serial_writeline block="serial|write %text"    
+    //% blockId=serial_writeline block="serial|write %text"
     export function writeLine(text: string): void {
         writeString(text);
         writeString("\r\n");