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Devel docs: Mention mid-end background clearing

--- a/devel.but

+++ b/devel.but

@@ -1438,7 +1438,9 @@

 area. Since this often involves drawing visual furniture which is

 never subsequently altered, it is often simplest to arrange this by

 having a special \q{first time} flag in the draw state, and

-resetting it after the first redraw.

+resetting it after the first redraw.  This function can assume that

+the mid-end has filled the drawing area with colour 0 before the first

+call.

 When this function (or any subfunction) calls the drawing API, it is

 expected to pass colour indices which were previously defined by the