obnoxious byte-compiler warning from using lsh

[Noah Friedman]

The the master branch, the docstring for `lsh' says:

    This function is provided for compatibility.  In new code, use `ash'
    instead."

`lsh' and `ash' are not the same thing, the difference is important and
they are both essential operators.  This proffered suggestion, along with
the byte compiler warning, is...well, it's not even wrong. It's just a
non-sequitur.