Recipes using the same libraries are indistinguishable

[richardhuxton]

For the cookbook entries covering "command line arguments" I made one recipe using Cmdliner and two using the standard-library (once with Sys.argv and once with Arg). Of course you can't tell the two apart on the listing.

It feels like the simplest fix might be to add a new field in the yaml header title_postscript: " (Argv)" so the displayed title can be "using the Standard Library (Argv)". I'm happy to try and put a patch together if this sort of approach would be acceptable.