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Update from-into.md (#245)

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Explaining how those traits are used in practice and when you should use one over another.
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Igor Petruk 2023-01-23 13:18:34 +00:00 committed by GitHub
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@ -23,3 +23,11 @@ fn main() {
println!("{s}, {addr}, {one}, {bigger}");
}
```
<details>
* That's why it is common to only implement `From`, as your type will get `Into` implementation too.
* When declaring a function argument input type like "anything that can be converted into a `String`", the rule is opposite, you should use `Into`.
Your function will accept types that implement `From` and those that _only_ implement `Into`.
</details>