Update getting started docs for mypyc for Windows (#15233)

Update the link to latest version MS has on its website. (there's no
more build tools for 2017, just 2022) and also provide a bit more
information as to what to install. The Windows SDK is needed as well.

Co-authored-by: Valentin Stanciu <250871+svalentin@users.noreply.github>

Author: svalentin

mypyc/doc/getting_started.rst

@@ -32,7 +32,7 @@ Ubuntu 18.04, for example:
 Windows
 *******
 
-Install `Visual C++ <https://www.visualstudio.com/downloads/#build-tools-for-visual-studio-2017>`_.
+From `Build Tools for Visual Studio 2022 <https://www.visualstudio.com/downloads/#build-tools-for-visual-studio-2022>`_, install MSVC C++ build tools for your architecture and a Windows SDK. (latest versions recommended)
 
 Installation
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