Minor update on how to install MinGW cross-compiler toolchain.

[ci skip]

Docs/GettingStarted.dox

@@ -273,9 +273,7 @@ You can also build, deploy, run/debug (as C/C++ Remote %Application) using Eclip
 
 It is possible to cross-compile Urho3D for Windows using a Linux host system. The process is largely the same as the \ref Building_Native "Linux native build" process described above.
 
-To cross-compile, the MinGW toolchain (compiler, linker and w32api) needs to be installed on the system. You will also need the DirectX header files, those can be downloaded and installed from the following packet: https://www.libsdl.org/extras/win32/common/directx-devel.tar.gz.
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-For activating the MinGW toolchain, and to allow it to find the correct compiler, the MINGW_PREFIX environment variable needs to be set. This variable should be set to the prefix of the compiler name, e.g. /usr/bin/x86_64-w64-mingw32 where it would be used to find /usr/bin/x86_64-w64-mingw32-gcc and /usr/bin/x86_64-w64-mingw32-g++, etc. Optionally you can also set MINGW_SYSROOT environment variable or build option to point to your MinGW system root, if it is not installed in a normal expected location.
+To cross-compile, the MinGW compiler toolchain development software package ("mingw-w64" for Debian-based distro; "mingw64-gcc-c++" and "mingw64-winpthreads-static.noarch" for Redhat-based distro) needs to be installed on the system. For activating the MinGW compiler toolchain, and to allow it to find the correct compiler, the MINGW_PREFIX environment variable needs to be set. This variable should be set to the prefix of the compiler name, e.g. /usr/bin/x86_64-w64-mingw32 where it would be used to find /usr/bin/x86_64-w64-mingw32-gcc and /usr/bin/x86_64-w64-mingw32-g++, etc. Optionally you can also set MINGW_SYSROOT environment variable or build option to point to your MinGW system root, if it is not installed in a normal expected location. Adjust the software package name and the path accordingly for mingw32. It is recommended to use mingw64, when it is available for your host system, because it is multilib capable (can target both 32-bit and 64-bit).
 
 Execute cmake_mingw.sh then go to the build tree to execute make command. After the build is complete, the Windows executables can be found in the build tree's "bin" subdirectory.