Delete docs/Python_Dev_Notes.md (#20887)

It is no longer relevant since it is not a problem since python 3.5, and
the minimum python version we support is 3.8.
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# Python Dev Notes
Each Python version uses a specific compiler version. In most cases, you should use the same compiler version for building python extensions.
## Which Microsoft Visual C++ compiler to use with a specific Python version ?
| Visual C++ | CPython |
|-------------|:-----------------------:|
|2015, 2017 | 3.7 |
|2015 | 3.5,3.6 |
|2010 | 3.3,3.4 |
|2008 | 2.6, 2.7, 3.0, 3.1, 3.2 |
Currently, the official ONNXRuntime Python wheel (v1.3.0 onwards) hosted on PyPi requires [Visual C++ 2019 runtime ](https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads) installed on the target machine.
If the Python wheel is built from source using the build toolset provided with Visual Studio 2017, it will work with the Visual C++ 2017 runtime.
CPython 3.7 is distributed with a VC++ 2017 runtime. Unlike the earlier VC++ version, VC++ 2017 Runtime is binary backward compatible with VC++ 2015. Which means you could build your application with VC++ 2015 then run it with VC++ 2017 runtime.