docs for wait command include invalid syntax

[CharlesTaylor7]

Problem

The documentation for the wait command advertises syntax that doesn't actually parse.

On this page of the docs:
https://hyperscript.org/commands/wait/#description

This snippet:

wait for load or 1s
if the result is not an Event
  throw 'Took too long to load.'
end

Workaround

The comparison the result is not an Event, fails to parse, but replacing the an with an a makes it hunky dory.

Potential Fix

Either we can (1) update the docs, or (2) update the parser to allow the construct of is not an Event.
I personally favor extending the parser to make this work.

Error

Stacktrace:

    at a.raiseParseError (http://unpkg.com/hyperscript.org@0.9.12:1:12649)
    at i.raiseError (http://unpkg.com/hyperscript.org@0.9.12:1:6620)
    at i.requireToken (http://unpkg.com/hyperscript.org@0.9.12:1:7520)
    at http://unpkg.com/hyperscript.org@0.9.12:1:71097