Documented a multiple argument alias solution.

Specifically, we have now solved the long-standing issue of how exactly to
define aliases accepting multiple arguments. The happy-go-lucky
"herestring trick" suffices to define aliases accepting single arguments but
fails to generalize beyond that. Fortunately, we've uncovered a mechanism:
define an alias defining a temporary alias undefining itself when expanded.

And thereby didst this Holy Universe soundlessly implode.