Auto merge of #26675 - azerupi:doc-js-keyevent, r=alexcrichton

Like explained in #26016, typing `?` had no effect with non-english keyboard layouts in the docs. 

This patch seems to resolve this issue, **tested with AZERTY keyboard in Google Chrome and Firefox**. I haven't tested it with more exotic keyboard layouts or with other browsers though.

This code is based on the information found on: http://javascript.info/tutorial/keyboard-events

**More specifically:**

> The only event which reliably provides the character is keypress.

**And**

>```
// event.type must be keypress
function getChar(event) {
  if (event.which == null) {
    return String.fromCharCode(event.keyCode) // IE
  } else if (event.which!=0 && event.charCode!=0) {
    return String.fromCharCode(event.which)   // the rest
  } else {
    return null // special key
  }
}
```

`?` and `S` work, `escape` however does not (on an Azerty keyboard). 

It would be good if some people could test it with other browsers and keyboard layouts: http://www.mathieudavid.org/test/rustdoc/std/index.html

**Edit:**
- swedish layout works on Firefox and Chromium
- french (azerty) mac layout works on Safari

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