update doc "How_To_Update_ONNX_Dev_Notes" (#1288)
update doc "How_To_Update_ONNX_Dev_Notes" (#1288)

* update documentation to match current code

* plus some wording changes

microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime,microsoft/onnxruntime