docs: clarify REGION_STATISTICS owned-SST semantics (nightly only)

[Copilot]

What's Changed in this PR

This updates REGION_STATISTICS nightly docs to match greptimedb PR #8191 behavior: region stats now count only SST data/index files owned by the region, excluding cross-region referenced SSTs.
The clarification is applied to both English and Chinese nightly docs only. Version-1.0 docs are not updated as this feature is not available in v1.0.

• Scope

  • Updated region_rows, sst_num, sst_size, and index_size field descriptions in:
    • docs/reference/sql/information-schema/region-statistics.md
    • i18n/zh/docusaurus-plugin-content-docs/current/reference/sql/information-schema/region-statistics.md

• Doc semantics aligned with engine behavior

  • region_rows: owned-SST rows + memtable rows
  • sst_size / sst_num / index_size: owned SST/index files only (listed in table column order)
  • Referenced SSTs from other regions are explicitly documented as excluded

• Field description ordering

  • Reordered sst_size and sst_num bullets to match the example output table column order (sst_size before sst_num), making the docs easier to scan and cross-reference.

- `sst_size`: The region's total size of SST files owned by this region. SST files referenced from other regions are not counted.
- `sst_num`: The region's total number of SST files owned by this region. SST files referenced from other regions are not counted.
- `index_size`: The region's total size of index files owned by this region. SST index files referenced from other regions are not counted.

Checklist

• Please confirm that all corresponding versions of the documents have been revised.
• Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.
• This change requires follow-up update in localized docs.

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[Copilot]

Pull request overview

This PR clarifies the semantics of INFORMATION_SCHEMA.REGION_STATISTICS fields to match the updated GreptimeDB behavior: statistics now count only SST/index files owned by the region, excluding cross-region referenced SSTs. The clarification is applied consistently across English/Chinese docs and both current and version-1.0 doc sets.

Changes:

• Clarifies region_rows as “owned-SST rows + memtable rows,” excluding rows from referenced SSTs.
• Clarifies sst_num, sst_size, and index_size as counting only owned SST/index files, excluding referenced SSTs.
• Applies the same wording updates across current and version-1.0, in both English and Chinese.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
docs/reference/sql/information-schema/region-statistics.md	Updates field descriptions to document owned-SST-only semantics for region statistics.
versioned_docs/version-1.0/reference/sql/information-schema/region-statistics.md	Mirrors the same owned-SST-only clarifications for the v1.0 doc set.
i18n/zh/docusaurus-plugin-content-docs/current/reference/sql/information-schema/region-statistics.md	Chinese localization update for current, aligning wording with owned-SST-only semantics.
i18n/zh/docusaurus-plugin-content-docs/version-1.0/reference/sql/information-schema/region-statistics.md	Chinese localization update for v1.0, aligning wording with owned-SST-only semantics.

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[WenyXu]

@copilot apply suggestions

[Copilot]

@copilot apply suggestions

Done — swapped sst_num and sst_size bullets to match the table column order (sst_size before sst_num) in all four files (EN/ZH, current/v1.0). Commit: docs: reorder sst_size/sst_num bullets to match table column order.

[WenyXu]

@copilot only update nightly docs.

[Copilot]

@copilot only update nightly docs.

Reverted the changes to versioned_docs/version-1.0/ and i18n/zh/.../version-1.0/ — nightly docs (docs/ and i18n/zh/.../current/) remain updated.