svg_tetraflexagon_editor: fix comment

The comment was copied from the Hexaflexagon example, but here the tiles
are rectangles, not polygons, amend the comment to reflect that.

diff --git a/src/svg_tetraflexagon_editor.py b/src/svg_tetraflexagon_editor.py
index 90668e3..6b57160 100755 (executable)
--- a/src/svg_tetraflexagon_editor.py
+++ b/src/svg_tetraflexagon_editor.py
@@ -97,7 +97,7 @@ class SvgwriteTetraflexagonDiagram(TetraflexagonDiagram):
 
         super(SvgwriteTetraflexagonDiagram, self).draw_tile_template(tile, cx, cy, theta)
 
-        # The tile outline in the active group's element is the only polygon
+        # The tile outline in the active group's element is the only rectangle
         # element, so get it and set its id so that it can be reused as
         # a clip-path
         for element in self.backend.active_group.elements: