Clarify: ICollection<T>.Remove(T) vs. EntityFrameworkCore.DbSet<T>.Remove(T)

In the "Removing Relationships" I suggest clarifying ICollection.Remove(T) vs. EntityFrameworkCore.DbSet.Remove(T).

Note that there is no "Deleting Data" section in this docs section, since deletions happen when saving - but shouldn't the docs first advise the reader that to delete, they most likely should use DbSet.Remove(T) rather than deleting the relationship - which has its own big section? This is likely to be important to anyone who reverse engineered from a database without cascade delete configured for required FK relationships.

Thanks!
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* ID: 0f0fb981-4dec-7ff7-817b-6606f620b875
* Version Independent ID: c7517e7d-f011-a24c-53da-913771913998
* Content: [Saving Related Data - EF Core](https://docs.microsoft.com/en-us/ef/core/saving/related-data)
* Content Source: [entity-framework/core/saving/related-data.md](https://github.com/dotnet/EntityFramework.Docs/blob/main/entity-framework/core/saving/related-data.md)
* Product: **entity-framework**
* Technology: **entity-framework-core**
* GitHub Login: @ajcvickers
* Microsoft Alias: **avickers**