Fixed a syntax error

enzosalvador_reading/bookshelf/urls.py

@@ -9,6 +9,6 @@ urlpatterns = [
     path('authors/<int:pk>/details/', AuthorsDetailView.as_view(), name='author-details'),
     path('books/add/', BookCreateView.as_view(), name='add-book'),
     path('authors/add/', AuthorCreateView.as_view(), name='add-author'),
-    path('books/<int:pk>/edit/', BookUpdateView.as_view(), name='edit-book'),
+    path('books/<pk>/edit/', BookUpdateView.as_view(), name='edit-book'),
     path('authors/<pk>/edit/', AuthorUpdateView.as_view(), name='edit-author'),
 ]
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