My system does not have an orientation command. If your does:
doc orientation
help orientation
type orientation
are all ways of seeing the use and syntax. The first being the easiest (but requiring the most work of the creator of the function) and the last being the hardest (but requiring the least work from the creator of the function).
You can also figure out the toolbox where orientation comes from with
which orientation
Finally, are you sure you do not mean
doc orient
