The toc directive will take the level of the first header as the topmost
level, even if there are higher levels seen later in the file.
+To create a table of contents that only shows headers starting with a given
+level, use the `startlevel` parameter. For example, to show only h2 and
+smaller headers:
+
+ \[[!toc startlevel=2]]
+
The table of contents will be created as an ordered list. If you want
an unordered list instead, you can change the list-style in your local
style sheet.