Updated docs to configure extension header to I/O before colourtail is used. Also updated example

Author: Thomas Preston

docs/example.rst

@@ -89,6 +89,9 @@ configure ColourTails to be driven from leg 0.
     >>> codebug.set_row(1, 0b01110)
     >>> codebug.set_row(0, 0b00100)
 
+    >>> # make sure the extension header is configured as I/O
+    >>> codebug.config_extension_io()
+
     >>> # initialise the colourtail (using EXT_CS pin)
     >>> colourtail.init()
     >>> colourtail.set_pixel(0, 255, 0, 0)  # red

examples/colourtail.py

@@ -16,9 +16,11 @@
     codebug.set_row(1, 0b01110)
     codebug.set_row(0, 0b00100)
 
+    codebug.config_extension_io()
+
     # initialise the colourtail (using EXT_CS pin)
-    # colourtail.init()
-    colourtail.init(use_leg_0_not_cs=True)
+    colourtail.init()
+    # colourtail.init(use_leg_0_not_cs=True)
     colourtail.set_pixel(0, 255, 0, 0)  # red
     colourtail.set_pixel(1, 0, 255, 0)  # green
     colourtail.set_pixel(2, 0, 0, 255)  # blue