[stable-25-2] Added spilling docs (#21718)

[lll-phill-lll]

(cherry picked from commit efe102d)

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🟢 2025-09-12 15:00:22 UTC The validation of the Pull Request description is successful.

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❌ Documentation build

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❌ Link is unreachable: en/reference/configuration/memory_controller_config.md in en/concepts/spilling.md.

❌ Link is unreachable: en/reference/configuration/memory_controller_config.md in en/reference/configuration/table_service_config.md.

❌ Link is unreachable: en/reference/configuration/memory_controller_config.md in en/troubleshooting/spilling/index.md.

❌ Link is unreachable: ru/reference/configuration/memory_controller_config.md in ru/concepts/spilling.md.

❌ Link is unreachable: ru/reference/configuration/memory_controller_config.md in ru/reference/configuration/table_service_config.md.

❌ Link is unreachable: ru/reference/configuration/memory_controller_config.md in ru/troubleshooting/spilling/index.md.

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⚪ 2025-09-12 15:14:17 UTC Pre-commit check linux-x86_64-relwithdebinfo for bed6446 has started.
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🟢 2025-09-12 15:17:04 UTC Build successful.

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🟢 2025-09-12 15:17:16 UTC Build successful.

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⚪ 2025-09-14 12:32:20 UTC Pre-commit check linux-x86_64-relwithdebinfo for c4179f2 has started.
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Test history | Ya make output | Test bloat

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0	0	0	0	0	0

🟢 2025-09-14 12:35:04 UTC Build successful.

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✅ Documentation build

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⚪ 2025-09-14 12:34:42 UTC Pre-commit check linux-x86_64-release-asan for c4179f2 has started.
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0	0	0	0	0	0

🟢 2025-09-14 12:37:28 UTC Build successful.

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⚪ 2025-09-14 12:47:50 UTC Pre-commit check linux-x86_64-release-asan for bce70d3 has started.
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🟢 2025-09-14 12:50:31 UTC Tests successful.

Test history | Ya make output | Test bloat

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

🟢 2025-09-14 12:50:38 UTC Build successful.

[github-actions]

⚪ 2025-09-14 12:47:52 UTC Pre-commit check linux-x86_64-relwithdebinfo for bce70d3 has started.
⚪ 2025-09-14 12:48:04 UTC Artifacts will be uploaded here
⚪ 2025-09-14 12:50:26 UTC ya make is running...
🟢 2025-09-14 12:50:31 UTC Tests successful.

Test history | Ya make output | Test bloat

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

🟢 2025-09-14 12:50:38 UTC Build successful.