branch-3.0: [test](doc) add cancel-warm-up example in doris's doc to regression test #43286

[github-actions]

Cherry-picked from #43286

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1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
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[doris-robot]

run buildall