e223624e2e
This commit fixes the layout of the Reference page. Previously, the toctree level was "2", which made the page hard to navigate. This PR changes the level to "1". In addition, the capitalization of page titles is fixed. This is a follow-up PR to the ones that created and updated the Reference section. It must be backported to branch-5.4. Closes scylladb/scylladb#15830