Commit 10d1b1f25 added a hint about which word would be found by
a certain regexp:
"A call to str.match(/\w+/) will find only the first word in the line
(var). That’s not it."
Unfortunately the result is incorrect: the regexp would find `let`, not
`var`.
Updating the hint should resolve any confusion. The example has been
tested in the console to ensure that the regexp does indeed return
`let`.
ec81513954