All statements now use .. namedconf:statement:: or
.. rndcconf:statement:: syntax provided by our Sphinx extension.
This has several consequences:
- It changes how statement headings are rendered
- Statements are indexed and show up as separate items in doc
search results (in the HTML version)
- Statements can be linked to using either :any:`statement` or
:namedconf:ref:`statement` syntax (not used in this commit)
- Statements can be categorized and printed using ..
namedconf:statatementlist:: syntax (not used in this commit)
