Add error code 20258 for unsupported section sync

[manjushm-microsoft]

Important

Required for API changes:

• [] Link to API.md file: ADD LINK HERE
• [] Link to PR for public-facing schema changes (schema-Prod-beta/v1.0.csdl): ADD LINK HERE

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Add other supporting information, such as a description of the PR changes:

ADD INFORMATION HERE

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[learn-build-service-prod]

Learn Build status updates of commit d2767c7:

✅ Validation status: passed

File	Status	Preview URL	Details
concepts/onenote-error-codes.md	✅Succeeded

For more details, please refer to the build report.

[Danipocket]

PR approved.