config: Use consistent advice on flashing the Melzi board

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

config/printer-wanhao-duplicator-i3-v2.1-2017.cfg

@@ -1,20 +1,22 @@
-# This file contains pin mappings and other appropriate default parameters
-# for a Wanhao Duplicator i3 v2.1 and its clones
-# (Monoprice Maker Select, Cocoon Create, etc.)
-# See the files example.cfg and example-extras.cfg for a description of available parameters.
+# This file contains pin mappings and other appropriate default
+# parameters for a Wanhao Duplicator i3 v2.1 and its clones (Monoprice
+# Maker Select, Cocoon Create, etc.).
 #
 # This will probably work on older revisions (v1.0, v2.0) of the printer
 # but is untested on those versions.
-#
+
+# Note, a number of Melzi boards are shipped with a bootloader that
+# requires the following command to flash the board:
+#  avrdude -p atmega1284p -c arduino -b 57600 -P /dev/ttyUSB0 -U out/klipper.elf.hex
+# If the above command does not work and "make flash" does not work
+# then one may need to flash a bootloader to the board - see the
+# Klipper docs/Bootloaders.md file for more information.
+
+# See the example.cfg file for a description of available parameters.
+
 # For best results with klipper and the Wanhao Duplicator i3, follow these
 # guidelines:
 #
-# - Flash a bootloader to the Melzi board in the printer
-#   See http://www.instructables.com/id/Using-an-Arduino-to-Flash-the-Melzi-Board-Wanhao-I/
-#
-# - Make sure the auto-reset jumper is *enabled* on the Melzi board
-#   (See step 1 in the bootloader tutorial above)
-#
 # - Locate the USB serial port for your printer in /dev/serial/by-id/ format.
 #   See https://github.com/KevinOConnor/klipper/blob/master/docs/FAQ.md#wheres-my-serial-port
 #   It will be something like: