Fix some compilation warnings (#1010)

* Fixe some summary warning

* Fixed more warning

* Uniformed example projects code

* Uniformed test projects code

* Fix OperatingSystems enum and GenericType summaries

tests/KubernetesClient.Tests/QuantityValueTests.cs

@@ -1,5 +1,5 @@
-using System;
 using k8s.Models;
+using System;
 using Xunit;
 using static k8s.Models.ResourceQuantity.SuffixFormat;