Tweak a cloud hint message (gammafunk)

Tell the player what to do in response to the next prompt they'll
get (5 and . will just make the game nag them to hit Y or N,
which seems annoying?), and don't tell them to try to wait out
clouds unconditionally, since a lot of them (including those from
the first tutorial!) come from cloud generators. (So waiting isn't
a great solution...)

Still probably useful to suggest waiting, since some clouds *do*
vanish over time... idk.