[cherry-pick][test](doc) add some import-example in doris's doc to regression test(#43123)

[yagagagaga]

(cherry picked from commit a3e8de7)

What problem does this PR solve?

Issue Number: close #xxx

Related PR: cherry-pick #43123

Problem Summary:

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No colde files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

• Release note

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[doris-robot]

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR

Since 2024-03-18, the Document has been moved to doris-website.
See Doris Document.

[yagagagaga]

run buildall

[yagagagaga]

run p0