Document startup policies

Document how `REGCLS_SINGLEUSE` and  `REGCLS_MULTIPLEUSE` can be used to configure object "connection" policies.

Doc:
* [REGCLS](https://learn.microsoft.com/en-us/windows/win32/api/combaseapi/ne-combaseapi-regcls) enumeration
* [CoRegisterClassObject](https://learn.microsoft.com/en-us/windows/win32/api/combaseapi/nf-combaseapi-coregisterclassobject) function