update: 📝 open api setup option

it should be yaml instead of json.

/**
   * Path of the YAML API definition to serve.
   * Default: `<path>-json`.
   */
  yamlDocumentUrl?: string;

Author: mdirshaddev

content/openapi/introduction.md

@@ -162,7 +162,7 @@ export interface SwaggerCustomOptions {
 
   /**
    * Path of the YAML API definition to serve.
-   * Default: `<path>-json`.
+   * Default: `<path>-yaml`.
    */
   yamlDocumentUrl?: string;