Reorder the description of transaction modes by strictness

[avpershin]

Changelog entry

Reorder the description of transaction modes by strictness

Changelog category

• Documentation (changelog entry is not required)

Description for reviewers

There is a page in the YDB documentation, which describes the transaction modes.

https://ydb.tech/docs/ru/concepts/transactions#modes

This section starts with mentioning the Serializable mode (the strictest mode) and then describes other modes, but the other modes are described in essentially random order, which makes it hard to read and to understand their logic. This change reorders the descriptions so that the modes are described in the order of reduced strictness (from the most strict to the least strict mode). This makes it easier to understand which guarantee is "removed" from the previous mode and which performance characteristics are "gained" from the previous mode.

For comparison, the SQL isolation levels on the official Wikipedia page are also listed in the order of reduced strictness.

https://en.wikipedia.org/wiki/Isolation_(database_systems)#Isolation_levels

NOTE: There are no changes to the actual description of the modes. Only the order is changed.

[github-actions]

🟢 2025-09-12 11:43:26 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-09-12 11:54:29 UTC Pre-commit check linux-x86_64-relwithdebinfo for 4ebfbbd has started.
⚪ 2025-09-12 11:54:56 UTC Artifacts will be uploaded here
⚪ 2025-09-12 11:57:53 UTC ya make is running...
🟢 2025-09-12 11:57:59 UTC Tests successful.

Test history | Ya make output | Test bloat

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

🟢 2025-09-12 11:58:05 UTC Build successful.

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Warnings (2)

⚠️ ru/yql/reference/syntax/alter-transfer.md: 14: MD051 / link-fragments Link fragments should be valid [Context: "lambda-функция"]

⚠️ ru/yql/reference/syntax/create-transfer.md: 16: MD051 / link-fragments Link fragments should be valid [Context: "lambda-функция"]

[ydbot]

🔄 New commits pushed — @a-s-maslov please take a look.

[github-actions]

⚪ 2025-09-12 11:55:27 UTC Pre-commit check linux-x86_64-release-asan for 4ebfbbd has started.
⚪ 2025-09-12 11:56:02 UTC Artifacts will be uploaded here
⚪ 2025-09-12 11:59:01 UTC ya make is running...
🟢 2025-09-12 11:59:06 UTC Tests successful.

Test history | Ya make output | Test bloat

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

🟢 2025-09-12 11:59:13 UTC Build successful.

[github-actions]

✅ Documentation build

Revision built successfully
Revision preview link

Build logs

Warnings (2)

⚠️ ru/yql/reference/syntax/alter-transfer.md: 14: MD051 / link-fragments Link fragments should be valid [Context: "lambda-функция"]

⚠️ ru/yql/reference/syntax/create-transfer.md: 16: MD051 / link-fragments Link fragments should be valid [Context: "lambda-функция"]