Documentation: increase example cache timeout to 1 hour

Documentation: increase example cache timeout to 1 hour

Previously, the example *decreased* the cache timeout compared to the
default, making it less user friendly.

Instead, nudge users to make cache more usable. Many users choose
store over cache.
https://lore.kernel.org/git/CAGJzqskRYN49SeS8kSEN5-vbB_Jt1QvAV9QhS6zNuKh0u8wxPQ@mail.gmail.com/

The default timeout remains 15 minutes. A stronger nudge would
be to increase that.

Signed-off-by: M Hickford <mirth.hickford@gmail.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>