Documentation: fix wrong envvar in windows xcompile instructions, better wording

Documentation/cross-compiling-for-windows-with-wine.md

@@ -3,7 +3,7 @@
 This can be useful to test engine in Wine without using virtual machines or dual-booting to Windows.
 
 0. Clone and install https://github.com/mstorsjo/msvc-wine (you can skip CMake part)
-1. Set environment variable WINE_MSVC_PATH to the path to installed MSVC toolchain
+1. Set environment variable MSVC_WINE_PATH to the path to installed MSVC toolchain
 2. Pre-load wine: `wineserver -k; wineserver -p; wine64 wineboot`
 3. Run `./waf configure -T <build-type> --enable-wine-msvc --sdl2=../SDL2_VC`. Configuration step will take more time than usual.
-4. Follow other typical steps to build from console, except keep in mind you're in decent Operating System now.
+4. .. other typical steps to build from console ...