error in rotatingFanInRoom tutorial for pimpleFoam

Small bug in the incompressible/pimpleFoam/RAS/rotatingFanInRoom tutorial (version 2106)

snappyHexMeshDict needs change in locationInMesh location. The original location points into a face.

Suggested fix is:

locationInMesh (0.1001 0.001 0.0101);

in <system>/snappyHexMeshDict