changed help button link to melodic2 docs

melodic.tcl

@@ -367,7 +367,7 @@ pack $w.varnorm $w.dim  $w.thresh $w.ostats $w.report -in $fmri(melodicf) -ancho
     bind $w.cancel <Return> {
         [winfo toplevel %W].cancel invoke}
  
-    button $w.help -command "FmribWebHelp file: ${FSLDIR}/doc/melodic/index.html" \
+    button $w.help -command "FmribWebHelp file: ${FSLDIR}/doc/melodic2/index.html" \
             -text "Help" -width 5
     bind $w.help <Return> {
         [winfo toplevel %W].help invoke}