Fix: Update withAuthorInfo() to use plural table names

The `BookModel::withAuthorInfo()` method in the Controller guide uses singular table names (book, author) instead of the plural names (books, authors) created in the Database Setup migration.

Fixes #10057

Author: AlexRasch

user_guide_src/source/guides/api/code/013.php

@@ -15,8 +15,8 @@ class BookModel extends Model
      */
     public function withAuthorInfo()
     {
-        return $this
-            ->select('book.*, author.id as author_id, author.name as author_name')
-            ->join('author', 'book.author_id = author.id');
+          return $this
+            ->select('books.*, authors.name as author_name')
+            ->join('authors', 'books.author_id = authors.id');
     }
 }