Updates headers on code example

Author: mikenomitch

src/content/docs/workflows/index.mdx

@@ -42,7 +42,7 @@ This gives you:
 - Simple and expressive code for complex processes
 
 <Tabs>
-	<TabItem label="index.ts">
+	<TabItem label="Workflow Code">
 ```ts
 export class CheckoutWorkflow extends WorkflowEntrypoint {
 	async run (event, step) {
@@ -61,7 +61,7 @@ export class CheckoutWorkflow extends WorkflowEntrypoint {
 
 ````
 </TabItem>
-<TabItem label="wrangler.jsonc">
+<TabItem label="Workflow Config">
 
 ```json
 {