Update manage-creation-of-groups.md

[rui0122]

Yammer administrator can create M365 group as it has microsoft.directory/groups.unified/create as an action. https://learn.microsoft.com/en-us/entra/identity/role-based-access-control/permissions-reference#yammer-administrator

[learn-build-service-prod]

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[v-jmathew]

This PR has been open for an extended period of time and has conflicts. If these changes are still relevant, please re-submit them to https://github.com/MicrosoftDocs/microsoft-365-docs-pr/.