Fixed method name

Author: Microsoft Graph DevX Tooling

src/Microsoft.OpenApi.OData.Reader/Operation/EdmOperationOperationHandler.cs

@@ -180,7 +180,7 @@ private void GenerateTagName(out string tagName, int skip = 1)
                     }
                     break;
                 default:
-                    tagName = NavigationSource.Name + "." + NavigationSource.EntityType.Name;
+                    tagName = NavigationSource.Name + "." + NavigationSource.EntityType().Name;
                     break;
             }
         }