Fixed a typo.

src/drc/drc/built-in-macros/drc.lym

@@ -896,7 +896,7 @@ CODE
     #
     # This method produces markers on the corners of the polygons. An angle criterion can be given which
     # selects corners based on the angle of the connecting edges. Positive angles indicate a left turn
-    # while negative angles indicate a right turn. Since polygons are oriented clockwise, postive angles
+    # while negative angles indicate a right turn. Since polygons are oriented clockwise, positive angles
     # indicate concave corners while negative ones indicate convex corners.
     # 
     # The markers generated can be point-like edges or small 2x2 DBU boxes. The latter is the default.