Fix missing comma in OpenAPI generator configuration example

This PR fixes a syntax error in the OpenAPI generator configuration documentation where a comma is missing between globalHost and handleApi properties.

Changes made:

Added missing comma after globalHost: 'globalThis' configuration option
This fixes the JSON syntax error that would cause configuration parsing to fail
Before fix:

<JAVASCRIPT>
globalHost: 'globalThis'  // <- Missing comma here
/**
 * (Optional) Filter or transform generated API interface functions...
 */
handleApi: apiDescriptor => {
After fix:

<JAVASCRIPT>
globalHost: 'globalThis',  // <- Comma added
/**
 * (Optional) Filter or transform generated API interface functions...
 */
handleApi: apiDescriptor => {
This is a documentation fix that improves the user experience for developers following the OpenAPI generator configuration examples. Without this fix, users copying the example configuration would encounter syntax errors.

Author: TAYUN

docs/tutorial/02-getting-started/09-openapi-integration.md

@@ -141,7 +141,7 @@ module.exports = defineConfig({
       /**
        * Host object for global API mounting. Default is `globalThis` (represents `window` in browsers and `global` in Node.js).
        */
-      globalHost: 'globalThis'
+      globalHost: 'globalThis',
 
       /**
        * (Optional) Filter or transform generated API interface functions. Return a new `apiDescriptor` to generate API call functions. If not specified, the `apiDescriptor` object remains unchanged.