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>
1 file changed
tree: 121294226b866ebab538bad8b73557f1f49e499f
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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