Wrong braces should be detected

A contributor used `(#...)` instead of real issue link.

```markdown
- Changed: <kbd>Ctrl</kbd> + <kbd>Shift</kbd> + <kbd>L</kbd> now opens the terminal in the active library directory (#14130)
```

Heylogs should have detected, shouldn't it?

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Triggered by https://github.com/JabRef/jabref/pull/14256