Dead link in API summary: /api-reference/search/points

The "run a search" link in fern/pages/api-summary.mdx (step 3 of "How does Qdrant work?") returns 404 on https://api.qdrant.tech. This page is the summary for all doc versions.

Fix: point it to /api-reference/search/query-points (verified live, returns 200).

Planned for after the 1.20 release. The first attempt (#63) was closed because the OpenAPI sync workflow pushed unrelated spec changes into the PR.