Corrected docs
Resolves bug report http://www.openfoam.org/mantisbt/view.php?id=1100
Corrected dimensions comment for critical volume
Resolves bug report http://www.openfoam.org/mantisbt/view.php?id=1101
Merge branch 'master' of github.com:OpenFOAM/OpenFOAM-2.2.x