Typo, 43.6.3.2: infinity loop should be infinite loop

[PeterWhittaker]

[rauschma]

This typo will be fixed in the next release, thanks for reporting it!

( Note: the best way to report typos is via the chapter issues. The web pages link to them at the bottom. Example: https://github.com/rauschma/impatient-js/issues/34 )