Use 10h in both obj-fresh examples

Author: Kalle Fagerberg

src/content/docs/customizing/obj-fresh.mdx

@@ -21,7 +21,7 @@ with value format [time.Duration](https://golang.org/pkg/time/#ParseDuration).
   <TabItem label="Config file">
   ```yaml
   # ~/.kube/color.yaml
-  objFreshThreshold: 1h
+  objFreshThreshold: 10h
   ```
   </TabItem>
 </Tabs>