Add programmatically destroy to api docs (#438)

Author: artur-demidov

docs/src/content/guides/api.mdx

@@ -60,4 +60,6 @@ driverObj.getState();
 // Look at the DriveStep section of configuration for format of the step
 // https://driverjs.com/docs/configuration/#drive-step-configuration
 driverObj.highlight({ /* ... */ }); // Highlight an element
+
+driverObj.destroy(); // Destroy the tour
 ```