Append '_d' to the output executable file name in the example.

Related to commit 78436eecd4648410c21ad5f0171bc93b28eca20a.

Docs/GettingStarted.dox

@@ -449,7 +449,7 @@ $CC -o Urho3DPlayer Urho3DPlayer.cpp `pkg-config --cflags --libs Urho3D`
 export CC=${MINGW_PREFIX}-c++
 export PKG_CONFIG_SYSROOT_DIR=${MINGW_ROOT}
 export PKG_CONFIG_PATH=${MINGW_ROOT}/usr/local/lib/pkgconfig
-$CC -o Urho3DPlayer.exe Urho3DPlayer.cpp `pkg-config --cflags --libs Urho3D |sed 's/-lUrho3D/-lUrho3D_d.dll/g'`
+$CC -o Urho3DPlayer_d.exe Urho3DPlayer.cpp `pkg-config --cflags --libs Urho3D |sed 's/-lUrho3D/-lUrho3D_d.dll/g'`
 \endcode
 
 \section Scaffolding Project scaffolding