Fix header formatting in entitlement management docs

[rykoma]

Important

Required for API changes:

• [] Link to API.md file: https://github.com/microsoftgraph/microsoft-graph-docs-contrib/blob/main/api-reference/v1.0/api/entitlementmanagement-post-assignmentpolicies.md
• [] Link to PR for public-facing schema changes (schema-Prod-beta/v1.0.csdl): N/A
• [] OPTIONAL: Attach the documentation plan generated for AI-assisted docs authoring and validation to help speed up content review.

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

Fix header formatting in entitlement management docs

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[learn-build-service-prod]

Learn Build status updates of commit 249bf26:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/api/entitlementmanagement-post-assignmentpolicies.md	✅Succeeded

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit bd99338:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/api/entitlementmanagement-post-assignmentpolicies.md	✅Succeeded

For more details, please refer to the build report.