docs: document scheduled jobs interval (#13350)

www/apps/book/generated/edit-dates.mjs

@@ -128,5 +128,6 @@ export const generatedEditDates = {
   "app/learn/introduction/from-v1-to-v2/page.mdx": "2025-07-30T08:13:48.592Z",
   "app/learn/debugging-and-testing/debug-workflows/page.mdx": "2025-07-30T13:45:14.117Z",
   "app/learn/fundamentals/data-models/json-properties/page.mdx": "2025-07-31T14:25:01.268Z",
-  "app/learn/debugging-and-testing/logging/custom-logger/page.mdx": "2025-08-28T15:37:07.328Z"
+  "app/learn/debugging-and-testing/logging/custom-logger/page.mdx": "2025-08-28T15:37:07.328Z",
+  "app/learn/fundamentals/scheduled-jobs/interval/page.mdx": "2025-08-29T11:45:01.882Z"
 }

www/apps/book/generated/sidebar.mjs

@@ -916,6 +916,16 @@ export const generatedSidebars = [
                 "children": [],
                 "chapterTitle": "3.9.1. Execution Number",
                 "number": "3.9.1."
+              },
+              {
+                "loaded": true,
+                "isPathHref": true,
+                "type": "link",
+                "path": "/learn/fundamentals/scheduled-jobs/interval",
+                "title": "Set Interval",
+                "children": [],
+                "chapterTitle": "3.9.2. Set Interval",
+                "number": "3.9.2."
               }
             ],
             "chapterTitle": "3.9. Scheduled Jobs",