fix i2cwritebuffer signature

libs/core/_locales/core-jsdoc-strings.json

@@ -513,4 +513,4 @@
   "serial.writeValue": "Write a name:value pair as a line to the serial port.",
   "serial.writeValue|param|name": "name of the value stream, eg: x",
   "serial.writeValue|param|value": "to write"
-}
+}

libs/core/pins.cpp

@@ -381,7 +381,7 @@ namespace pins {
      * Write bytes to a 7-bit I2C `address`.
      */
     //%
-    int void i2cWriteBuffer(int address, Buffer buf, bool repeat = false)
+    int i2cWriteBuffer(int address, Buffer buf, bool repeat = false)
     {
       return uBit.i2c.write(address << 1, (char*)buf->data, buf->length, repeat);
     }