Update guides/source/upgrading_ruby_on_rails.md

Co-authored-by: zzak <[email protected]>

Author: rafaelfranca

guides/source/upgrading_ruby_on_rails.md

@@ -260,9 +260,14 @@ If you run a single file's tests (`bin/rails test test/models/user_test.rb`), `t
 ### Import syntax from `@rails/ujs` is modified
 
 Starting from Rails 7.1, the syntax for importing modules from `@rails/ujs` is modified. Rails no longer supports the
-direct import of a module from `@rails/ujs`. If users create and build a JavaScript file with the line `import
-{ fileInputSelector } from "@rails/ujs"`, they will encounter the error `export 'fileInputSelector'
-(imported as 'fileInputSelector') was not found in '@rails/ujs' (possible exports: default)`.
+direct import of a module from `@rails/ujs`.
+
+For example, attempting to import a function from the library will fail:
+
+\```
+import { fileInputSelector } from "@rails/ujs"
+#=> export 'fileInputSelector' (imported as 'fileInputSelector') was not found in '@rails/ujs' (possible exports: default)
+\```
 
 In Rails 7.1, users should first import the Rails object directly from `@rails/ujs`.
 Users can then import specific modules from the Rails object.