Pydantic AI's docs restructure gives Capabilities a top-level section
(/ai/capabilities/) with a page per built-in capability. Update all
/ai/core-concepts/capabilities/ links accordingly, and make the core
built-ins explicit in the 'What goes where?' breakdown — naming and
linking web search, web fetch, image generation, compaction, tool
search, on-demand loading, thinking, and MCP, plus the full built-in
list on the Capabilities overview.
Merge together with the pydantic-ai docs restructure release: the new
/ai/capabilities/ URLs only exist once that release is synced to
pydantic.dev.
