handy.h: Remove docs for non-existent macro

In commit 3c3ecf18c35ad7832c6e454d304b30b2c0fef127, I mistakenly added
documentation for a non-existent macro.  It turns out that only the
variants listed for that macro exist, and not the base macro.  Since we
are in code freeze, the solution has to be not to change code by adding
the base macro, but to delete the documentation, or change it to refer
to just the existing versions.  In order to not cause an entry that is
anomalous to the others, for this release, I'm just getting rid of the
documentation.