small updates

INSTALL.txt

@@ -62,7 +62,7 @@ Follow the instructions found in OpenModelica/OMCompiler/README-OMDev-MINGW.txt
 
 MSYS setting (optional)
 =======================
-If you want to use msys shell make a  
+If you want to use msys2.exe shell make a  
 shortcut on your desktop to: 
 path_to_your_omdev\tools\msys\msys2.exe
 and say it to run in:
@@ -73,14 +73,14 @@ QT DEBUG DLLS (optional)
 We don't ship the debug dlls for qt5, you can reinstall the qt packages to get them.
 Start msys2 shell: path_to_your_omdev\tools\msys\msys2.exe
 Type command:
-> pacman -S mingw-w64-i686-qt5 mingw-w64-x86_64-qt5
+> pacman -S mingw-w64-{i686,x86_64}-qt5
 
 OpenSceneGraph DEBUG DLLS (optional)
 ====================================
 We don't ship the debug dlls for OSG, you can install them with the following command.
 Start msys2 shell: path_to_your_omdev\tools\msys\msys2.exe
 Type command:
-> pacman -S mingw-w64-i686-OpenSceneGraph-debug mingw-w64-x86_64-OpenSceneGraph-debug
+> pacman -S mingw-w64-{i686,x86_64}-OpenSceneGraph-debug
 
 Address questions/problems to:
 Adrian Pop,