[azservicebus] Fixing syntax errors in the migrationguide.md (#16232)
[azservicebus] Fixing syntax errors in the migrationguide.md (#16232)

Fixing some syntax errors in the migrationguide.md.
Azure/azure-sdk-for-go,Azure/azure-sdk-for-go,Azure/azure-sdk-for-go,Azure/azure-sdk-for-go