Make ToolbarItem constructor match properties (#4333)

This changes the `ToolbarItem` constructor's `name` parameter to `text`, to match the non-obsolete `Text` that gets the value. Without the change, it's confusing when tracing data flow related to `Text`, since it doesn't appear at first that it's being set.

Xamarin.Forms.Core/ToolbarItem.cs

@@ -16,12 +16,12 @@ namespace Xamarin.Forms
 		{
 		}
 
-		public ToolbarItem(string name, string icon, Action activated, ToolbarItemOrder order = ToolbarItemOrder.Default, int priority = 0)
+		public ToolbarItem(string text, string icon, Action activated, ToolbarItemOrder order = ToolbarItemOrder.Default, int priority = 0)
 		{
 			if (activated == null)
 				throw new ArgumentNullException("activated");
 
-			Text = name;
+			Text = text;
 			Icon = icon;
 			Clicked += (s, e) => activated();
 			Order = order;
@@ -54,4 +54,4 @@ namespace Xamarin.Forms
 			remove { Clicked -= value; }
 		}
 	}
-}
+}