Align 6 PRs from docs-cn

[TomShawn]

What is changed, added or deleted? (Required)

Align 6 PRs from docs-cn, mostly bug fixes.

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

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v6.0 (TiDB 6.0 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• 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• This PR is translated from: Modify the name of the Oracle and PostgreSQL docs-cn#7357 Delete an outdated note docs-cn#8328 data-type-string.md: correct the description of char type docs-cn#8329 sql-statement-create-index.md: fix the example of expression index create by 'create table'  docs-cn#8332 Add some tableoptions about Alter table docs-cn#8339 Fix a typo in sql-plan-replayer.md docs-cn#8423
• 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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• shichun-0415

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[shichun-0415]

Seems this PR is not translated: https://github.com/pingcap/docs-cn/pull/8339/files. PTAL. The rest looks good to me.

[TomShawn]

Seems this PR is not translated: https://github.com/pingcap/docs-cn/pull/8339/files. PTAL. The rest looks good to me.

Because it's already there in docs.

[shichun-0415]

Seems this PR is not translated: https://github.com/pingcap/docs-cn/pull/8339/files. PTAL. The rest looks good to me.

Because it's already there in docs.

Get. Maybe it's better to label the source PR as "translation no need"?

[shichun-0415]

LGTM

[TomShawn]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 2d12a4d

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #8196.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #8197.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #8198.