example.html: remove extra whitespace (#32143)

If we don't pass `class` to the `placeholder` shortcode, this resulted in two spaces before the `alt` attribute:

```html
{{< example >}}
{{< placeholder width="64" height="64" >}}
{{< /example >}}
```

```html
<img src="..."  alt="...">
```

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XhmikosR

2020-11-13 12:45:11 +02:00

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