Document that the `FromSql` change to throw with an incorrect provider also impacts in-memory

[ajcvickers]

When we documented this we only did it in the context of Cosmos. See https://learn.microsoft.com/en-us/ef/core/what-is-new/ef-core-7.0/breaking-changes#using-fromsqlraw-and-related-methods-from-the-wrong-provider-throws-use-the-correct-method

Document that it also applies to in-memory. See dotnet/efcore#30246