correlated-subquery-optimization, explain-subqueries: update operator IDs in examples

[time-and-fate]

What is changed, added or deleted? (Required)

In #11624 we updated the execution plans in some examples, but we didn't update the operator IDs in the corresponding text.

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[qiancai]

Removed the needs-cherry-pick-release-6.4 label because the v6.4 docs have been archived at https://docs-archive.pingcap.com/zh/tidb/v6.4 and will no longer receive new updates.

[qiancai]

Removed the needs-cherry-pick-release-6.6 label because the v6.6 docs have been archived at https://docs-archive.pingcap.com/zh/tidb/v6.6 and will no longer receive new updates.

[lilin90]

Since the descriptions had been fixed in #15393, I'll close this PR.