releases: fix the PROGRESS column name in the v6.4.0 release notes

[yahonda]

What is changed, added or deleted? (Required)

In the v6.4.0 release notes, the TiFlash replica progress item says:

In TiDB, the PROGRESS field of the INFORMATION_SCHEMA.TIFLASH_REPLICA table is used to indicate the progress … In earlier TiDB versions, the PROCESS field only provides the progress of data replication during the creation of the TiFlash replicas.

The second sentence refers to the same column, but spells it PROCESS. The column is PROGRESS in earlier versions too; for example, TiDB v6.2.0 defines it as {name: "PROGRESS", tp: mysql.TypeDouble, size: 22} in infoschema/tables.go. This PR changes PROCESS to PROGRESS.

This was found while reviewing the Japanese translation (#24157), which mirrors the EN text. This PR targets release-8.5 so that the weekly EN→JA sync carries the fix to the Japanese docs.

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)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

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

• This PR is translated from:
• Other reference link(s):

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

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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