Reconcile contradictory Search code rate limit on the search REST page

[viraatdas]

Fixes #43865.

The REST search docs page stated two different rate limits for GET /search/code on the same page. In the hand-written "About search" prose, the Search code endpoint was described as limited to 9 requests per minute, while the auto-generated "Search code" endpoint section (generated from the OpenAPI description) lists 10 requests per minute.

This aligns the hand-written prose to the auto-generated endpoint value (10 requests per minute), which is the source of truth, so the page is internally consistent. Only the prose above the autogeneration marker is changed; no generated content is touched, and no other numbers are altered.

Prepared with AI assistance.

[github-actions]

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