Document how insert/update/delete statements are ordered when SaveChanges is called

Is there a sequence of sql statements when savechanges is called? or should we assume they are arbitrary and just use transactions if we want them to occur in sequence?

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* ID: 23f8db8b-8ee6-86c9-7cb2-b5802214ec13
* Version Independent ID: b959839c-684e-5d60-650e-0af17c971c79
* Content: [Basic Save - EF Core](https://docs.microsoft.com/en-us/ef/core/saving/basic)
* Content Source: [entity-framework/core/saving/basic.md](https://github.com/aspnet/EntityFramework.Docs/blob/master/entity-framework/core/saving/basic.md)
* Product: **entity-framework**
* Technology: **entity-framework-core**
* GitHub Login: @rowanmiller
* Microsoft Alias: **divega**