Update site-follow.md

[rykoma]

Important

Use the AI-powered workflow for Graph onboarding to author and self-review schema-related changes. See https://aka.ms/msgo for more information.

Required for API changes:

• [] Link to API.md file: https://github.com/microsoftgraph/microsoft-graph-docs-contrib/blob/main/api-reference/v1.0/api/site-follow.md
• [] Link to PR for public-facing schema changes (schema-Prod-beta/v1.0.csdl): N/A

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

Updated user ID in the follow site API request example, because it was not a valid GUID format.

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Important

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[microsoft-github-policy-service]

Thank you for indicating that your pull request is ready for content review, @@rykoma. It has been added to the Content Review project and an available reviewer will be assigned in the next one (1) business day, depending on demand. If this PR relates to any schema changes, refer to the pull request description box for quick instructions to move this PR forward.

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[learn-build-service-prod]

Learn Build status updates of commit 5199f43:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/api/site-follow.md	✅Succeeded

For more details, please refer to the build report.