update tidb-distributed-execution-framework.md (#18268)

[ti-chi-bot]

This is an automated cherry-pick of #18268

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What is changed, added or deleted? (Required)

Remove the timestamp limitation because the following issues are fixed:

• Data inconsistency after adding index in ingest mode tidb#46033
• Daylight saving times are not properly handled during add index tidb#47426
• data inconsistency in table after upgrade tidb from 7.5 to nightly with enable tidb_enable_dist_task add index tidb#48724

And no new timestamp related issues were found.

Which TiDB version(s) do your changes apply to? (Required)

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For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v8.0 (TiDB 8.0 versions)
• v7.6 (TiDB 7.6 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)

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

• This PR is translated from: update tidb-distributed-execution-framework.md docs-cn#17956
• Other reference link(s):

Do your changes match any of the following descriptions?

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

[qiancai]

/approve

[ti-chi-bot]

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