ENH: Allrun: added comment

tutorials/mesh/foamyQuadMesh/OpenCFD/Allrun

@@ -4,6 +4,11 @@ cd ${0%/*} || exit 1    # run from this directory
 # Source tutorial run functions
 . $WM_PROJECT_DIR/bin/tools/RunFunctions
 
+
+# Make sure surface is oriented properly. Since the letters
+# contain disconnected regions use
+#   surfaceOrient -usePierceTest
+
 cp system/controlDict.mesher system/controlDict
 
 runApplication surfaceFeatureExtract