See, reading the message in English and then see one small part in localized language is confusing either way (if it’s not English).
In any case, “details” is not descriptive, so you should provide the summary of what you hide.
<details><summary>the summary</summary>
```typ
stuff
```
</details>
or
[details="Summary"]
This text will be hidden
[/details]
Which is an option in the dropdown menu in the editor (to not write it manually).