Mention ToString in std::fmt docs

[killercup]

I just noticed that neither the std::fmt documentation nor the docs for format! mention the ToString trait or its to_string method.

I realize this is not strictly related to formatting, but I can also imagine a lot of people looking for ways to get string representations of their data types. We should help them find this shortcut.

[frewsxcv]

Can you expand on why we should link to ToString from these pages? We link to Display which is necessary to implement format!("{}", ...)

[killercup]

To teach people that instead of `format!("{}", foo)` they can also write `foo.to_string()`. This was motivated by https://twitter.com/yoshuawuyts/status/1051394862023495680

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Am 27.10.2018 um 03:25 schrieb Corey Farwell ***@***.***>: Can you expand on why we should link to ToString from these pages? We link to Display which is necessary to implement format!("{}", ...) — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.