fix: add space in error message for document deletion

Author: Kornel-Toth

test/examples/src/delete_doc.py

@@ -43,5 +43,5 @@
 except ApiException as ae:
     if ae.status_code == 404:
         print('Cannot delete document because either ' +
-              f'"{example_db_name}" database or "{example_doc_id}"' +
+              f'"{example_db_name}" database or "{example_doc_id}" ' +
               'document was not found.')