In the Maths section of the documentation, the entry for LSH and RSH says:
LSH x y << left shift x by y bits, in effect
multiply by 2 to the power of x.
The number of bits shifted dictates the number of powers of 2 raised, so it should read:
LSH x y << left shift x by y bits, in effect
multiply x by 2 to the power of y.
Same goes for the RSH entry. It seems to be like that everywhere those commands are listed.
(I will look into setting up GitHub on my PC, to avoid hassling anyone with small typos like this.)