one more redirect

Author: BillWagner

.openpublishing.redirection.csharp.json

@@ -648,6 +648,10 @@
       "source_path_from_root": "/docs/csharp/features.md",
       "redirect_url": "/dotnet/csharp/programming-guide/concepts"
     },
+    {
+      "source_path_from_root": "/docs/csharp/fundamentals/null-safety/resolve-warnings.md",
+      "redirect_url": "/dotnet/csharp/fundamentals/null-safety/common-tasks/resolve-warnings"
+    },
     {
       "source_path_from_root": "/docs/csharp/generics.md",
       "redirect_url": "/dotnet/csharp/fundamentals/types/generics"