fix: address final widget review findings

apps/docs/docs/widgets/rss-feed/index.mdx

@@ -31,6 +31,8 @@ import screenshot from "./img/screenshot.png";
 
 <WidgetConfig configuration={rssFeedWidget.configuration} />
 
+If one configured feed fails, the widget keeps entries from healthy feeds visible and shows a warning. If a refresh fails after entries have loaded, the previous entries stay visible with a stale-data warning.
+
 ### Examples
 
 Here's a small collection of examples, that you can use for testing or actual use (in no particular order):

apps/docs/docs/widgets/timetable/index.mdx

@@ -36,3 +36,5 @@ import streetDepartures from "./img/street-departures.png";
 <WidgetConfig configuration={timetableWidget.configuration} />
 
 For security, all custom base URLs must resolve to a public IP address whenever Homarr uses them. Private and local hosts are rejected.
+
+If a timetable refresh fails after departures have loaded, the widget keeps the previous departures visible and marks them with their last update time.