fix cron format (#7931)

Author: josefaidt

src/pages/[platform]/build-a-backend/functions/scheduling-functions/index.mdx

@@ -99,13 +99,13 @@ export const remindMe = defineFunction({
     // every sunday at midnight
     "every week",
     // every tuesday at 5pm
-    "0 17 * * 2",
+    "0 17 * ? 3 *",
     // every wednesday at 5pm
-    "0 17 * * 3",
+    "0 17 * ? 4 *",
     // every thursday at 5pm
-    "0 17 * * 4",
+    "0 17 * ? 5 *",
     // every friday at 5pm
-    "0 17 * * 5",
+    "0 17 * ? 6 *",
   ]
 })
 ```
@@ -143,9 +143,9 @@ export const remindMe = defineFunction({
   name: "remind-me-to-take-the-trash-out",
   schedule: [
     // every tuesday at 9am
-    "0 9 * * 2",
+    "0 9 * ? 3 *",
     // every friday at 9am
-    "0 9 * * 5",
+    "0 9 * ? 6 *",
   ]
 })
 ```