en: how to suspend a tidb cluster

[Oreoxmt]

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What is changed, added, or deleted? (Required)

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

• master (the latest development version)
• v2.0 (TiDB Operator 2.0 versions)
• v1.6 (TiDB Operator 1.6 versions)
• v1.5 (TiDB Operator 1.5 versions)
• v1.4 (TiDB Operator 1.4 versions)
• v1.3 (TiDB Operator 1.3 versions)

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

• This PR is translated from: zh: how to suspend a tidb cluster #2754
• Other reference link(s):

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