I created some entries and used the following description, wich I find under the WYSIWYG Entry Editor.
This text editor supports the following types of markup:
-[[entry title]] creates a link to another entry in this folder. Or, click the Wikilink editor toolbar button.
-==Section name== and ===Subsection name=== add sections and subsections to your text.
The following is in HTML. I do not want to edit the HTML code, but you can see better what I mean.

I created the following entry:
HTML Code:
<p>==‹berschrift 1==</p>
<p>Viel Text...</p>
<p>&nbsp;</p>
<p>==‹berschrift 2==</p>
<p>Viel Text...</p>
<p>&nbsp;</p>
<p>==‹berschrift 3==</p>
<p>Viel Text...</p>
<p>&nbsp;</p>
<p>==‹berschrift 4==</p>
<p>Viel Text...</p>
I clicked OK, now i want to edit only the Text subsection "‹berschrift 3", clicked on the "Edit" Link and I have the following HTML output.
HTML Code:
<p>&nbsp;</p>
<p><br /> <br /></p> <!-- Whats that?-->
<p>==‹berschrift 3==</p>
<p>&nbsp;</p>          <!-- Whats that?-->
<p>Viel Text... Und noch mehr</p>
<p>&nbsp;</p>          <!-- Whats that?-->
<p>&nbsp;</p>
<p>==‹berschrift 4==<br /> <br /></p>
I have added the comments, where you can see some HTML tags wich I have not added or wanted to have a new line there.