doc: add note about timeout delay > TIMEOUT_MAX

When setTimeout() and setInterval() are called with `delay` greater than
TIMEOUT_MAX (2147483647), the supplied value is ignored and 1 is used
instead. Add a note about this in the timers docs.

PR-URL: https://github.com/nodejs/node/pull/3512


Reviewed-By: Trevor Norris <trev.norris@gmai.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>