clarification onf editor<%> refresh method

svn: r7461

collects/scribblings/gui/editor-intf.scrbl

@@ -1853,11 +1853,11 @@ See also @method[editor<%> add-undo].
            void?]{
 
 Repaints a region of the editor, generally called by an editor
- administrator. See @secref["editorthreads"] for information about
- edit sequences and refresh requests.
-  
-The @scheme[x], @scheme[y], @scheme[width], and @scheme[height] arguments specify
- the area that needs repainting in editor coordinates.
+ administrator. The @scheme[x], @scheme[y], @scheme[width], and
+ @scheme[height] arguments specify the area that needs repainting in
+ editor coordinates. The @method[editor-admin% get-dc] method of the
+ editor's administrator (as returned by @method[editor<%> get-admin])
+ supplies the target @scheme[dc<%>] object and offset for drawing.
 
 See @|drawcaretdiscuss| for information about @scheme[draw-caret].
 
@@ -1867,6 +1867,9 @@ The @scheme[background] color corresponds to the background of the
  background (or not paint the background of @scheme[background] is
  @scheme[#f]).
 
+See @secref["editorthreads"] for information about edit sequences and
+ refresh requests.
+
 }
 
 

collects/scribblings/gui/editor-overview.scrbl

@@ -204,9 +204,9 @@ Each selectable entity in an editor is an @deftech{item}. In a
  @deftech{count}.
 
 Each place where the insertion point can appear in a text editor is a
- @deftech{position}. A text editor with $n$ items contains $n+1$
- positions: one position before each item, and one position after the
- last item.
+ @deftech{position}. A text editor with @math{n} items contains
+ @math{n+1} positions: one position before each item, and one position
+ after the last item.
 
 The order of snips within a pasteboard determines each snip's drawing
  plane. When two snips overlap within the pasteboard, the snip that is

collects/scribblings/reference/write.scrbl

@@ -209,3 +209,4 @@ which is called by the default port print handler (see
 @scheme[port-print-handler]) to @scheme[print] values into a port.
 The default value uses the built-in printer (see
 @secref["printing"]) in @scheme[write] mode.}
+