Code snippet in Git issue comment spoiler requires a useless new line

Try 0:

<details>
<summary>Click this to collapse/fold.</summary>

```
PASTE LOGS HERE
```
</details>

Click this to collapse/fold.

PASTE LOGS HERE

works but not:

Try 1:

<details>
<summary>Click this to collapse/fold.</summary>
```
PASTE LOGS HERE
```
</details>

Click this to collapse/fold.

``` PASTE LOGS HERE ```

Note that <summary> does not seem mandatory, as it defaults to Details.

Related to Benjamin-Loison/gitea/issues/65 and Improve_websites_thanks_to_open_source/issues/884.

+288

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