Update documentation on the new pipeline Blender -> FBX -> Unity

[fnunnari]

Remember to list the FBX export options:

• Select Armature + Meshes
• Export FBX
  In Include panel
  • (tick) Selected Objects
  • (select) Mesh and Armature
    In Transform panel
  • default
    In Geometry panel
  • (untick) Apply modifiers
    In Armature panel
  • (untick) Add leaf Bones
    In Animation
  • (untick) Key All Bones (this might be the one causing for unwanted animations)

Remove the step asking to unpack textures as files