Fix PipelineNameComparer example in documentation (#1931)

Author: jwagon

docs/advanced/dependency-injection.md

@@ -291,7 +291,7 @@ public sealed class PipelineNameComparer : IEqualityComparer<MyPipelineKey>
 {
     public bool Equals(MyPipelineKey x, MyPipelineKey y) => x.PipelineName == y.PipelineName;
 
-    public int GetHashCode(MyPipelineKey obj) => (obj.PipelineName, obj.InstanceName).GetHashCode();
+    public int GetHashCode(MyPipelineKey obj) => obj.PipelineName.GetHashCode();
 }
 ```
 <!-- endSnippet -->

src/Snippets/Docs/DependencyInjection.cs

@@ -225,7 +225,7 @@ public sealed class PipelineNameComparer : IEqualityComparer<MyPipelineKey>
     {
         public bool Equals(MyPipelineKey x, MyPipelineKey y) => x.PipelineName == y.PipelineName;
 
-        public int GetHashCode(MyPipelineKey obj) => (obj.PipelineName, obj.InstanceName).GetHashCode();
+        public int GetHashCode(MyPipelineKey obj) => obj.PipelineName.GetHashCode(StringComparison.Ordinal);
     }
 
     #endregion