Python API has no AddConfigEntry and `kOrtSessionOptionsConfigAllow…

…IntraOpSpinning` (#17712)

### Description
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https://github.com/microsoft/onnxruntime/blob/bcc6205161969b292c66601ef9b080dd418d21a2/include/onnxruntime/core/session/onnxruntime_session_options_config_keys.h#L94C74-L94C105

### Motivation and Context
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- If it fixes an open issue, please link to the issue here. -->


@ivberg

docs/performance/tune-performance/threading.md

@@ -25,7 +25,7 @@ sess_options = rt.SessionOptions()
 sess_options.intra_op_num_threads = 0
 sess_options.execution_mode = rt.ExecutionMode.ORT_SEQUENTIAL
 sess_options.graph_optimization_level = rt.GraphOptimizationLevel.ORT_ENABLE_ALL
-sess_options.AddConfigEntry(kOrtSessionOptionsConfigAllowIntraOpSpinning, "1")
+sess_options.add_session_config_entry("session.intra_op.allow_spinning", "1")
 ```