Support blank lines in callouts

Support blank lines in callouts.

Current:

Wanted:

Workaround

Using Tab

Related requests

Hi.

Does this work as you want?

> [!NOTE] Callout
> line 00  
> line 01
> 
> line 02
> 
> line 03

Blank lines are already supported in callouts, as lostinbase shows. Is that not working for you?