strconv: show what fmt package uses for float printing
The strconv docs are not very helpful for people who just want to pick
a reasonable default, for example the one used by the fmt package to
show floats.
Add an example illustrating what the fmt package uses.
Change-Id: Iefefa70dfd4d4bfa9962a20654ee23662818ef38
Reviewed-on: https://go-review.googlesource.com/c/go/+/463980
Run-TryBot: Ian Lance Taylor <iant@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>