Fixed section heading tags (<h3>, <h4>, <h5>) so they are consistent

Sections and subsection headers were inconsistent in their usage
of html heading tags.

The majority of section headings use the following tags based on
their indent attribute:

indent="." or blank =>  <h3>
indent=".."         =>  <h4>
indent="..."        =>  <h5>

However, some of the "..." level tags used <p><em></em></p> or even
<h3> some times. There were inconsistencies like this in a few places.

Now, all of the section headings conform to the above scheme.
1 file changed