fix: use is None instead of == None (PEP 8 E711)

Author: harshadkhetpal

sagemaker-core/src/sagemaker/core/tools/resources_codegen.py

@@ -643,7 +643,7 @@ def _get_shape_attr_documentation_string(
                 #  exclude resource attributes from documentation
                 continue
             else:
-                if documentation == None:
+                if documentation is None:
                     documentation_string += f"{attribute_snake}: \n"
                 else:
                     documentation_string += f"{attribute_snake}: {documentation}\n"