docs: fix examples in Analytics Module docs (#13259)

* docs: fix example in Analytics Module docs

* generate

www/apps/resources/app/infrastructure-modules/analytics/posthog/page.mdx

@@ -128,13 +128,14 @@ You'll first create a [workflow](!docs!/learn/fundamentals/workflows) that track
 For example, create a workflow at `src/workflows/track-order-placed.ts` with the following content:
 
 export const workflowHighlights = [
-  ["13", "resolve", "Resolve the Analytics Module's service"],
-  ["15", "track", "Track the event in the installed Analytics Module Provider"]
+  ["14", "resolve", "Resolve the Analytics Module's service"],
+  ["16", "track", "Track the event in the installed Analytics Module Provider"]
 ]
 
 ```ts title="src/workflows/track-order-created.ts" highlights={workflowHighlights}
 import { createWorkflow } from "@medusajs/framework/workflows-sdk"
 import { createStep } from "@medusajs/framework/workflows-sdk"
+import { useQueryGraphStep } from "@medusajs/medusa/core-flows"
 import { Modules } from "@medusajs/framework/utils"
 import { OrderDTO } from "@medusajs/framework/types"
 
@@ -149,11 +150,11 @@ const trackOrderCreatedStep = createStep(
 
     await analyticsModuleService.track({
       event: "order_created",
-      userId: order.customer_id,
+      actor_id: order.customer_id,
       properties: {
         order_id: order.id,
         total: order.total,
-        items: order.items.map((item) => ({
+        items: order.items?.map((item) => ({
           variant_id: item.variant_id,
           product_id: item.product_id,
           quantity: item.quantity,
@@ -184,7 +185,7 @@ export const trackOrderCreatedWorkflow = createWorkflow(
     })
     trackOrderCreatedStep({
       order: orders[0],
-    })
+    } as unknown as StepInput)
   }
 )
 ```