[docs] update review.md with details about backports

[blinkov]

Changelog entry

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Changelog category

• Documentation (changelog entry is not required)

Description for reviewers

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[Copilot]

Pull Request Overview

This PR enhances the documentation review guide by distinguishing review steps for new main-branch content and backported changes.

• Adds a placeholder section for main-branch PR guidance
• Introduces a detailed backport review checklist
• Clarifies branching and publication process for stable-branch backports

Comments suppressed due to low confidence (2)

ydb/docs/en/core/contributor/documentation/review.md:57

• This section is currently empty. Either populate it with the expected review steps for new main-branch PRs or remove the placeholder heading.

## If the PR is new content for the main branch

ydb/docs/en/core/contributor/documentation/review.md:57

• The heading level here matches the top-level checklist heading. Consider using a third-level heading (###) to nest it under the main Checklist section for better structure.

## If the PR is new content for the main branch

[github-actions]

🟢 2025-06-25 04:15:33 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-06-25 04:17:49 UTC Pre-commit check linux-x86_64-release-asan for c47fd83 has started.
⚪ 2025-06-25 04:17:59 UTC Artifacts will be uploaded here
⚪ 2025-06-25 04:20:19 UTC ya make is running...
🟢 2025-06-25 04:20:24 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
0	0	0	0	0	0

🟢 2025-06-25 04:20:30 UTC Build successful.

[github-actions]

⚪ 2025-06-25 04:18:02 UTC Pre-commit check linux-x86_64-relwithdebinfo for c47fd83 has started.
⚪ 2025-06-25 04:18:12 UTC Artifacts will be uploaded here
⚪ 2025-06-25 04:20:39 UTC ya make is running...
🟢 2025-06-25 04:20:45 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
0	0	0	0	0	0

🟢 2025-06-25 04:20:50 UTC Build successful.

[ydbot]

🔄 New commits pushed — @anton-bobkov please take a look.

[github-actions]

⚪ 2025-06-25 04:26:36 UTC Pre-commit check linux-x86_64-relwithdebinfo for f4b86e2 has started.
⚪ 2025-06-25 04:26:48 UTC Artifacts will be uploaded here
⚪ 2025-06-25 04:29:09 UTC ya make is running...
🟢 2025-06-25 04:29:15 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
0	0	0	0	0	0

🟢 2025-06-25 04:29:20 UTC Build successful.

[github-actions]

⚪ 2025-06-25 04:27:39 UTC Pre-commit check linux-x86_64-release-asan for f4b86e2 has started.
⚪ 2025-06-25 04:27:50 UTC Artifacts will be uploaded here
⚪ 2025-06-25 04:30:14 UTC ya make is running...
🟢 2025-06-25 04:30:19 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
0	0	0	0	0	0

🟢 2025-06-25 04:30:25 UTC Build successful.

[github-actions]

✅ Documentation build

Revision built successfully
Revision preview link

[ydbot]

🔄 New commits pushed — @anton-bobkov please take a look.

[github-actions]

⚪ 2025-07-03 05:24:13 UTC Pre-commit check linux-x86_64-relwithdebinfo for c2e5104 has started.
⚪ 2025-07-03 05:24:25 UTC Artifacts will be uploaded here
⚪ 2025-07-03 05:26:57 UTC ya make is running...
🟢 2025-07-03 05:27:03 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
0	0	0	0	0	0

🟢 2025-07-03 05:27:09 UTC Build successful.

[github-actions]

⚪ 2025-07-03 05:24:33 UTC Pre-commit check linux-x86_64-release-asan for c2e5104 has started.
⚪ 2025-07-03 05:24:44 UTC Artifacts will be uploaded here
⚪ 2025-07-03 05:27:12 UTC ya make is running...
🟢 2025-07-03 05:27:18 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
0	0	0	0	0	0

🟢 2025-07-03 05:27:24 UTC Build successful.

[github-actions]

✅ Documentation build

Revision built successfully
Revision preview link