Corrected typos

applications/utilities/surface/surfaceCoarsen/bunnylod/progmesh.C

@@ -158,7 +158,7 @@ float ComputeEdgeCollapseCost(Vertex *u,Vertex *v) {
         // The method of determining cost was designed in order
         // to exploit small and coplanar regions for
         // effective polygon reduction.
-        // Is is possible to add some checks here to see if "folds"
+        // Is possible to add some checks here to see if "folds"
         // would be generated.  i.e. normal of a remaining face gets
         // flipped.  I never seemed to run into this problem and
         // therefore never added code to detect this case.