sql-statement-create-binding: add note about truncation

[qiancai]

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What is the related PR or file link(s)?

• This PR is translated from: sql-statement-create-binding: add note about truncation docs#21825, dashboard: permissions for setting up SSO docs#21837, statements: add privilege details docs#21815
• Other reference link(s):

pingcap/tidb#63671

Do your changes match any of the following descriptions?

• Delete files
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• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-09-30 06:08:26.556648052 +0000 UTC m=+151286.813379451: ☑️ agreed by Oreoxmt.

[qiancai]

/approve

[ti-chi-bot]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #20974.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #20975.