docs: Drop references to Perl in glib-mkenums
docs: Drop references to Perl in glib-mkenums

The tool was ported to Python, but we should not mention the programming
language used, in case we port it to some other language in the distant
future.

endlessm/glib,endlessm/glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib,johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib