ImmutableArray<T>.Slice() method doesn't exist

[NWoodsman]

The documentation for .Net6 here suggests that a .Slice() method exists, however I cannot find it in .Net 6.

It appears that the method is implemented as part of System.Collections.Immutable v8.0.0.

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-collections

[gewarren]

Thank you for the feedback. The NuGet package is compatible with down-level versions, which is why the older versions are shown in the Applies to table. But we've also received a lot of feedback that this is too confusing. We have a design change in the works to hopefully make this less confusing. Closing as duplicate of #10012.