generate: fix usage stmt

Author: cwsmith

Diff for: test/generate.cc

@@ -145,7 +145,7 @@ void getConfig(int argc, char** argv) {
     "  --disable-volume                        Disable volume mesh generation\n"
     "  --disable-surface                       Disable suface mesh generation\n"
     "  --native-model=/path/to/model           Load the native Parasolid or ACIS model that the GeomSim model uses\n"
-    "  --surfaceMeshFile=/path/to/surfaceMesh  read or write the surface mesh - depends on generation mode\n";
+    "  --surface-mesh=/path/to/surfaceMesh  read or write the surface mesh - depends on generation mode\n";
 
   nativeModelFile = "";
   surfaceMeshFile = "";