When linking to a section in the documentation, the browser scrolls to the correct location, but the header covers the heading text. I haven't looked at the CSS, but I suspect the header is not being considered as part of the content area and as a result, is being rendered on top of the heading. Consequently, it's difficult to make use of such section links. While they should help direct a reader to a particular section, since the section heading is occluded, it makes the link less useful than directing a reader to the whole page.

As an example, the rendering of the JNI reflection docs looks like:

Whereas, it should look like: