Update sql-statement-load-data.md

[rkazak]

If you want that code to be useable via the copy option, then we need to remove the '-> ' indicators.

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Thank you, and welcome to pingcap/docs. 😃

[morgo]

/LGTM

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[REVIEW NOTIFICATION]

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[TomShawn]

/label needs-cherry-pick-5.0
/label needs-cherry-pick-master
/size small
/translation welcome

[TomShawn]

/lgtm

[TomShawn]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 42babb4

[ti-srebot]

cherry pick to release-5.0 in PR #5139

[ti-srebot]

cherry pick to master in PR #5140