Add back setter for scaffolded collection navigations

### Type of issue

Outdated article

### Description

[Add back setter for scaffolded collection navigations](https://github.com/dotnet/efcore/pull/30311)

### Page URL

https://learn.microsoft.com/en-us/ef/core/modeling/relationships/navigations#reference-navigations

### Content source URL

https://github.com/dotnet/EntityFramework.Docs/blob/main/entity-framework/core/modeling/relationships/navigations.md

### Document Version Independent Id

46d5e507-b441-4c2c-26c5-7e8a4b03b29a

### Article author

@ajcvickers