Fix: sphinx_doc_gen.py syntax error while generating PyDoc

Ref !130085

doc/python_api/sphinx_doc_gen.py

@@ -1658,7 +1658,7 @@ def pyrna2sphinx(basepath):
         del key, descr
 
         for func in struct.functions:
-            args_kw_only_index = next((i for i in i, prop in enumerate(func.args) if not prop.is_required), -1)
+            args_kw_only_index = next((i for i, prop in enumerate(func.args) if not prop.is_required), -1)
             if args_kw_only_index == -1:
                 args_str = ", ".join(prop.get_arg_default(force=False) for prop in func.args)
             else: