remove b key from vimbox

vim/vimbox

@@ -1,7 +1,7 @@
 #!/bin/bash
 function helpexit() {
     echo Edit a file with check list mod of vim.
-    echo "Key 'b' inserts a checkbox, space toggles the box."
+    echo "space toggles the box."
     echo "Ctrl-b in editing mode inserts a checkbox."
     echo All switches are passed on to vim.
     exit