Update the descriptions of the variable "tidb_scatter_region"

[Frank945946]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Update the descriptions of the variable "tidb_scatter_region"

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

• This PR is translated from: update the description of variable "tidb_scatter_region" docs-cn#19152
• 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

[ti-chi-bot]

Hi @Frank945946. Thanks for your PR.

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[Benjamin2037]

rest LGTM

[ti-chi-bot]

@Benjamin2037: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[ti-chi-bot]

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