chtMultiRegionFoam tutorial update

tutorials/heatTransfer/chtMultiRegionFoam/multiRegionHeater/0/alphat

-/*--------------------------------*- C++ -*----------------------------------*\
-| =========                 |                                                 |
-| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
-|  \\    /   O peration     | Version:  dev                                   |
-|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
-|    \\/     M anipulation  |                                                 |
-\*---------------------------------------------------------------------------*/
-FoamFile
-{
-    version     2.0;
-    format      ascii;
-    class       volScalarField;
-    location    "0.001";
-    object      alphat;
-}
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-dimensions      [1 -1 -1 0 0 0 0];
-
-internalField   uniform 0;
-
-boundaryField
-{
-    minY
-    {
-        type            alphatWallFunction;
-        value           uniform 0;
-    }
-    maxY
-    {
-        type            alphatWallFunction;
-        value           uniform 0;
-    }
-    minX
-    {
-        type            calculated;
-        value           uniform 0;
-    }
-    maxX
-    {
-        type            calculated;
-        value           uniform 0;
-    }
-    minZ
-    {
-        type            alphatWallFunction;
-        value           uniform 0;
-    }
-    maxZ
-    {
-        type            alphatWallFunction;
-        value           uniform 0;
-    }
-    topAir_to_leftSolid
-    {
-        type            calculated;
-        value           uniform 0;
-    }
-    topAir_to_heater
-    {
-        type            calculated;
-        value           uniform 0;
-    }
-    topAir_to_rightSolid
-    {
-        type            calculated;
-        value           uniform 0;
-    }
-}
-
-
-// ************************************************************************* //