Fix typo.

biscuit/apps/exlibris/views.py

@@ -53,7 +53,7 @@ def add_book(request: HttpRequest) -> HttpResponse:
 
 
 @login_required
-def edit_book(request: HttpRequest, id_: Optoinal[int] = None, isbn: Optional[str] = None) -> HttpResponse:
+def edit_book(request: HttpRequest, id_: Optional[int] = None, isbn: Optional[str] = None) -> HttpResponse:
     context = {}
 
     if id_: