v6.0 and v6.2: add a note for docs archiving

[qiancai]

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)

This PR adds a note to v6.0 and v6.2 release notes to let users know their doc locations.

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)
• v6.6 (TiDB 6.6 versions)
• v6.5 (TiDB 6.5 versions)
• v6.4 (TiDB 6.4 versions)
• v6.1 (TiDB 6.1 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)

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

• This PR is translated from: v6.0 and v6.2: add a note for docs archiving docs-cn#12808
• 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:

• ran-huang
• shichun-0415

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[shichun-0415]

LGTM

[qiancai]

/merge

[ti-chi-bot]

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

Commit hash: 61ab4b1

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #12347.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #12348.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.3: #12349.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #12350.