Add example of horizontal radios (#3009)

@navikt/core/react/src/layout/stack/Stack.tsx

@@ -39,10 +39,11 @@ export interface StackProps extends HTMLAttributes<HTMLDivElement> {
    * or an object of spacing tokens for different breakpoints.
    *
    * @example
-   * gap='4'
+   * gap="6"
+   * gap="8 4"
    * gap={{xs: '2', sm: '3', md: '4', lg: '5', xl: '6'}}
    */
-  gap?: ResponsiveProp<SpacingScale>;
+  gap?: ResponsiveProp<SpacingScale | `${SpacingScale} ${SpacingScale}`>;
   /**
    * CSS `flex-direction` property.
    * @default "row"

aksel.nav.no/website/pages/eksempler/radio-horizontal/horizontal.tsx

@@ -0,0 +1,25 @@
+import { Radio, RadioGroup, Stack } from "@navikt/ds-react";
+import { withDsExample } from "@/web/examples/withDsExample";
+
+const Example = () => {
+  return (
+    <RadioGroup legend="Har du barn?">
+      <Stack gap="0 6" direction={{ xs: "column", sm: "row" }} wrap={false}>
+        <Radio value="1">Ja</Radio>
+        <Radio value="0">Nei</Radio>
+      </Stack>
+    </RadioGroup>
+  );
+};
+
+// EXAMPLES DO NOT INCLUDE CONTENT BELOW THIS LINE
+export default withDsExample(Example);
+
+/* Storybook story */
+export const Demo = {
+  render: Example,
+};
+
+export const args = {
+  index: 0,
+};