docs: fix example of createFulfillment (#6088)

docs-util/typedoc-json-output/fulfillment.json

@@ -998,7 +998,7 @@
 											},
 											{
 												"kind": "code",
-												"text": "```ts\nclass MyFulfillmentService extends AbstractFulfillmentService {\n  // ...\n  async createFulfillment(\n    data: Record<string, unknown>,\n    items: LineItem,\n    order: Order,\n    fulfillment: Fulfillment\n  ) {\n    // No data is being sent anywhere\n    // No data to be stored in the fulfillment's data object\n    return {}\n  }\n}\n```"
+												"text": "```ts\nclass MyFulfillmentService extends AbstractFulfillmentService {\n  // ...\n  async createFulfillment(\n    data: Record<string, unknown>,\n    items: LineItem[],\n    order: Order,\n    fulfillment: Fulfillment\n  ) {\n    // No data is being sent anywhere\n    // No data to be stored in the fulfillment's data object\n    return {}\n  }\n}\n```"
 											}
 										]
 									}
@@ -3356,7 +3356,7 @@
 											},
 											{
 												"kind": "code",
-												"text": "```ts\nclass MyFulfillmentService extends AbstractFulfillmentService {\n  // ...\n  async createFulfillment(\n    data: Record<string, unknown>,\n    items: LineItem,\n    order: Order,\n    fulfillment: Fulfillment\n  ) {\n    // No data is being sent anywhere\n    // No data to be stored in the fulfillment's data object\n    return {}\n  }\n}\n```"
+												"text": "```ts\nclass MyFulfillmentService extends AbstractFulfillmentService {\n  // ...\n  async createFulfillment(\n    data: Record<string, unknown>,\n    items: LineItem[],\n    order: Order,\n    fulfillment: Fulfillment\n  ) {\n    // No data is being sent anywhere\n    // No data to be stored in the fulfillment's data object\n    return {}\n  }\n}\n```"
 											}
 										]
 									}

packages/medusa/src/interfaces/fulfillment-service.ts

@@ -238,7 +238,7 @@ export interface FulfillmentService extends TransactionBaseService {
    *   // ...
    *   async createFulfillment(
    *     data: Record<string, unknown>,
-   *     items: LineItem,
+   *     items: LineItem[],
    *     order: Order,
    *     fulfillment: Fulfillment
    *   ) {

www/apps/docs/content/references/fulfillment/classes/fulfillment.AbstractFulfillmentService.mdx

@@ -196,7 +196,7 @@ class MyFulfillmentService extends AbstractFulfillmentService {
   // ...
   async createFulfillment(
     data: Record<string, unknown>,
-    items: LineItem,
+    items: LineItem[],
     order: Order,
     fulfillment: Fulfillment
   ) {

www/apps/docs/content/references/fulfillment/interfaces/fulfillment.FulfillmentService.mdx

@@ -194,7 +194,7 @@ class MyFulfillmentService extends AbstractFulfillmentService {
   // ...
   async createFulfillment(
     data: Record<string, unknown>,
-    items: LineItem,
+    items: LineItem[],
     order: Order,
     fulfillment: Fulfillment
   ) {