Document inability to pass owned entities as ctor params in "Current shortcomings"

As per https://github.com/dotnet/efcore/issues/12078 , it is not currently possible to pass owned entities (or owned entity properties?) as constructor params to the parent entity. Given this is not currently available but appears to be being considered, this should probably be listed under "Current shortcomings"?

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#### Document Details

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* ID: d02e6748-42e0-000a-4945-42cd05a0b875
* Version Independent ID: e3effbd0-07f2-423d-4032-1722e75adb37
* Content: [Owned Entity Types - EF Core](https://docs.microsoft.com/en-us/ef/core/modeling/owned-entities)
* Content Source: [entity-framework/core/modeling/owned-entities.md](https://github.com/dotnet/EntityFramework.Docs/blob/master/entity-framework/core/modeling/owned-entities.md)
* Product: **entity-framework**
* Technology: **entity-framework-core**
* GitHub Login: @AndriySvyryd
* Microsoft Alias: **avickers**