Fix typo in python.rst (#4667)
Fix typo in python.rst (#4667)

In line 23 there was an extra closing brace.
Signed-off-by: Ishan Singh <084e2a704e72df2e4dde2a2accae4f5f0f2f7822@users.noreply.github.com>
onnx/onnx,onnx/onnx,onnx/onnx,onnx/onnx