encryption-at-rest: fix the file size

[qiancai]

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What is changed, added or deleted? (Required)

Fix a file size issue introduced in #2410. The unit in the Chinese doc is correct (https://github.com/pingcap/docs-cn/pull/3928/files).

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-08 23:53:28.148737095 +0000 UTC m=+487333.715506970: ☑️ 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-5.2: #16501.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.4: #16502.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #16503.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #16504.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-4.0: #16505.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.0: #16506.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.3: #16507.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.4: #16508.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.6: #16509.