Fix speelling

msg/UpdateModel.msg

 string name         # Name of model
 string frame_id     # world, geo
-string type         # m300, human, human_child
+string type         # m100, human, human_child
 float64 x           # x, east, or longitude
 float64 y           # y, north, or latitude
 float64 z           # z, up, or altitude above ellipsoid in meter (egm96)