Trim trailing whitespace

docs/isp_flashing_guide.md

@@ -90,7 +90,7 @@ and you should get something like the following output:
 
 Since our keyboard uses an `atmega32u4` (common), that is the chip we'll specify. This is the full command:
 
-     avrdude -c avrisp -P COM3 -p atmega32u4 -U flash:w:main.hex:i
+    avrdude -c avrisp -P COM3 -p atmega32u4 -U flash:w:main.hex:i
 
 You should see a couple of progress bars, then you should see: