TiKV configuration: add a backtick

[Liuxiaozhen12]

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

• master (the latest development version)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)
• v4.0 (TiDB 4.0 versions)
• v3.1 (TiDB 3.1 versions)
• v3.0 (TiDB 3.0 versions)
• v2.1 (TiDB 2.1 versions)

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

• This PR is translated from: TiKV configuration: defaultcf.titan config should not apply to other CFs docs#5936
• 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

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[TomShawn]

@Liuxiaozhen12 pingcap/docs#5936 should be aligned after other PRs. @en-jin19 will take care of these PRs.