Remove now-outdated non-null comment around #18217.

Author: DanielRosenwasser

src/services/navigateTo.ts

@@ -130,7 +130,7 @@ namespace ts.NavigateTo {
             textSpan: createTextSpanFromNode(declaration),
             // TODO(jfreeman): What should be the containerName when the container has a computed name?
             containerName: containerName ? (containerName as Identifier).text : "",
-            containerKind: containerName ? getNodeKind(container) : ScriptElementKind.unknown, // TODO: GH#18217 Just use `container ? ...`
+            containerKind: containerName ? getNodeKind(container) : ScriptElementKind.unknown,
         };
     }
 }