Add 'updated:' to the top-level completition list. (#8665)

Author: isoos

app/lib/frontend/templates/views/shared/search_banner.dart

@@ -112,6 +112,7 @@ String completionDataJson({
             'dependency:',
             'dependency*:',
             'publisher:',
+            'updated:',
           ],
         ),
         // TODO: Consider completion support for dependency:, dependency*: and publisher:
@@ -180,6 +181,13 @@ String completionDataJson({
             ...topics,
           ],
         ),
+        CompletionRule(
+          match: {'updated:'},
+          options: [
+            '3m',
+            '1y',
+          ],
+        ),
       ],
     ).toJson(),
   );