The documentation included some outdated instructions to change the
architecture, build type or target OS of a build done with MSVC.  This
commit updates the documentation to include the modern options
available, down to Visual Studio 2013.

Reported-by: Kyotaro Horiguchi
Author: Juan José Santamaría Flecha
Discussion: https://postgr.es/m/CAC+AXB0J7tAqW_2F1fCE4Dh2=Ccz96TcLpsGXOCvka7VvWG9Qw@mail.gmail.com
Backpatch-through: 12