search: section titles are sometimes buried under API documentation entries

Sometimes, section titles are not well-discoverable using the search because they are buried under much more "nichey", low-level entries.

Reproduction steps:

Search for "Lake".

(I need to go two pages (search box heights) down to actually find the "22.1 Lake" section is was looking for.

Expected behavior:

At least in this specific example, I think the search would benefit from having the "Lake" section as the top entry. However, this is a special case, and in general, there can be situations in which one wishes another item (with a better match) to be listed higher than a section title.

So I think the expected behavior is that the search increases the score of the sections, but does not always strictly prioritize them.

Start by reproducing the search for "Lake" in the reference manual and locate the search-ranking entry point. Compare the section result with the API documentation entries, then adjust the ranking so section titles receive a boost without always taking priority; done means the section is more discoverable while stronger matches can still rank higher.