Extra indentation in placeholder shortcode

[julien-deramond]

Description

At several places in the documentation such as https://boosted.orange.com/docs/5.3/components/card/#example, we use a placeholder shortcode defined at /site/layouts/shortcodes/placeholder.html.

In the code, those places can be found easily in Markdown files with this pattern: {{< placeholder.

This placeholder shows the code in the documentation, and there's an extra indentation for the last </svg>:

The goal of this issue is simply to fix the shortcode itself or its use in the documentation.