use Network enum

docs/content/references/ts-sdk/kiosk/advanced-examples.mdx

@@ -12,9 +12,9 @@ const otherType = `${packageId}::other_module::OtherStruct<${packageId}::other_c
 // initialize a kioskClient.
 const kioskClient = new KioskClient({
     client: new IotaClient({
-        url: getFullnodeUrl('testnet'),
+        url: getFullnodeUrl(Network.Testnet),
     }),
-    network: 'testnet',
+    network: Network.Testnet,
 });
 ```
 

docs/content/references/ts-sdk/kiosk/kiosk-client/introduction.mdx

@@ -10,17 +10,17 @@ Kiosk Client is the base for all Kiosk SDK functionality.
 You can follow the example to create a `KioskClient`. View next section for usage in custom networks.
 
 ```typescript
-import { KioskClient } from '@iota/kiosk';
+import { KioskClient, Network } from '@iota/kiosk';
 import { getFullnodeUrl, IotaClient } from '@iota/iota-sdk/client';
 
 // We need a IOTA Client. You can re-use the IotaClient of your project
 // (it's not recommended to create a new one).
-const client = new IotaClient({ url: getFullnodeUrl('testnet') });
+const client = new IotaClient({ url: getFullnodeUrl(Network.Testnet) });
 
 // Now we can use it to create a kiosk Client.
 const kioskClient = new KioskClient({
     client,
-    network: 'testnet',
+    network: Network.Testnet,
 });
 ```