[msitools] wixl: improve command line documentation

[Victor Toso <victortoso src gnome org>]

commit f91d6465eb1fad272993a55ac5ed3e5a191b082b
Author: don bright <hmbright fastmail com>
Date:   Sat Aug 11 00:48:22 2018 +0000

    wixl: improve command line documentation
    
    As wixl tool can take multiple input files, adding [INPUT_FILE2]
    should illustrate that better.
    
    https://gitlab.gnome.org/GNOME/msitools/merge_requests/4
    Reviewed-by: Victor Toso <victortoso redhat com>

 tools/wixl/wixl.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tools/wixl/wixl.vala b/tools/wixl/wixl.vala
index 25b6c9e..5ed382b 100644
--- a/tools/wixl/wixl.vala
+++ b/tools/wixl/wixl.vala
@@ -26,7 +26,7 @@ namespace Wixl {
         { "includedir", 'I', 0, OptionArg.STRING_ARRAY, ref opt_includedirs, N_("Include directory"), null },
         { "wxidir", 0, 0, OptionArg.STRING, ref wxidir, N_("System include directory"), null },
         { "only-preproc", 'E', 0, OptionArg.NONE, ref preproc, N_("Stop after the preprocessing stage"), 
null },
-        { "", 0, 0, OptionArg.FILENAME_ARRAY, ref files, null, N_("INPUT_FILE...") },
+        { "", 0, 0, OptionArg.FILENAME_ARRAY, ref files, null, N_("INPUT_FILE1 [INPUT_FILE2]...") },
         { null }
     };