docs: (ListState) update docs replacing obsolete method

doc/Learn/Mvux/ListStates.md

@@ -112,12 +112,12 @@ public async ValueTask TrimAll(CancellationToken ct = default)
 }
 ```
 
-Another overload is `UpdateAsync`, which allows you to apply an update on items that match a criteria. The `match` predicate is checked for each item. It the item matches the criteria, the updater is invoked which returns a new instance of the item with the update applied:
+Another overload is `UpdateAllAsync`, which allows you to apply an update on items that match a criteria. The `match` predicate is checked for each item. It the item matches the criteria, the updater is invoked which returns a new instance of the item with the update applied:
 
 ```csharp
 public async ValueTask TrimLongNames(CancellationToken ct = default)
 {
-    await MyStrings.UpdateAsync(
+    await MyStrings.UpdateAllAsync(
         match: item => item?.Length > 10,
         updater: item => item.Trim(),
         ct: ct);

src/Uno.Extensions.Reactive.Tests/Operators/Given_CoreListStateOperators.cs

@@ -4,7 +4,6 @@
 using FluentAssertions;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Newtonsoft.Json.Linq;
-using Uno.Extensions.Equality;
 using Uno.Extensions.Reactive.Testing;
 using KeyAttribute = Uno.Extensions.Equality.KeyAttribute;