This enhancement formats descriptions in config.cc using the standard markup language reStructuredText (RST).
By doing so, it improves the rendering of these descriptions in the documentation, allowing you to use various directives like admonitions, code blocks, ordered lists, and more.
Closesscylladb/scylladb#16311
so we can cross-reference them with the syntax like
:confval:`alternator_timeout_in_ms`.
or even render an option like:
.. confval:: alternator_timeout_in_ms
in order to make the headerlink of the option visible,
a new CSS rule is added.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>