We support the following syntaxes for internal links:
<span class="missing-link" style="color:darkred;">File</span>
to link to a file;<span class="missing-link" style="color:darkred;">File</span>
to link to a file and put a custom title in-place;<span class="missing-link" style="color:darkred;">File#Header</span>
to link to a specific header inside a file;