Add example of combining value conversion with format specifiers

[arthur-tacca]

It's not clear from the page at the moment how to combine value conversion (e.g. "{!s}".format(foo)) with format specifiers (e.g. resulting in "{!s:.5}".format(foo)). After trying a few combinations (like "{:!s.5}".format(foo)) I caved in and looked at the official documentation (horrors!). It would be nice if the value conversion section included an example with a format specifier. It wouldn't matter which format specifier because that would be enough to demonstrate the general syntax. Something common like padding would be good.

Sorry I haven't included a pull request with this request. 😢

[ulope]

Thanks for the suggestion! It's a good idea.

Sorry I haven't included a pull request with this request. 😢

No worries :)