TUT: update movingCone blockMesh to merge points (#1862)

- wedge geometry, so topology merge results in zero-sized faces.

tutorials/compressible/rhoCentralDyMFoam/movingCone/system/blockMeshDict

@@ -16,6 +16,8 @@ FoamFile
 
 scale   0.001;
 
+mergeType points;   // Wedge geometry - Merge points instead of topology
+
 vertices
 (
     (-7.5 0 0)

tutorials/compressible/sonicDyMFoam/movingCone/system/blockMeshDict

@@ -16,6 +16,8 @@ FoamFile
 
 scale   0.001;
 
+mergeType points;   // Wedge geometry - Merge points instead of topology
+
 vertices
 (
     (-7.5 0 0)

tutorials/incompressible/pimpleFoam/laminar/movingCone/system/blockMeshDict

@@ -16,6 +16,8 @@ FoamFile
 
 scale   0.001;
 
+mergeType points;   // Wedge geometry - Merge points instead of topology
+
 vertices
 (
     (-7.5 0 0)