Add TTLAfterFinished feature reference

[chuntaochen]

update the reference to indicate that TTLAfterFinished graduated to beta in zh doc
Ref:
pr en #28011
kubernetes/enhancements#592

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[tanjunchen]

谢谢贡献。根据汉化约定约定，我们会拒绝对页面的部分修改。部分修改针对的是对应页面的英文上游还有其他改动需要同步的情况。
一旦我们合并了此 PR，将来就无法根据文件的最后更改时间来判断是否有其他上游变更尚未同步。请理解。
请在 master 分支上执行以下命令查看上游尚未同步的更改：

./scripts/lsync.sh content/zh/docs/reference/command-line-tools-reference/feature-gates.md

[chuntaochen]

谢谢贡献。根据汉化约定约定，我们会拒绝对页面的部分修改。部分修改针对的是对应页面的英文上游还有其他改动需要同步的情况。
一旦我们合并了此 PR，将来就无法根据文件的最后更改时间来判断是否有其他上游变更尚未同步。请理解。
请在 master 分支上执行以下命令查看上游尚未同步的更改：

./scripts/lsync.sh content/zh/docs/reference/command-line-tools-reference/feature-gates.md

多谢提醒，之前不清楚相关规定

[chuntaochen]

/close

[k8s-ci-robot]

@chuntaochen: Closed this PR.

In response to this:

/close

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