[doc] Adding cobra support for gtkeditors

[maboiteaspam]

Hi,

I followed wiki on ide and script editor's for cobra.

especially,
http://cobra-language.com/trac/cobra/wiki/GtkEditors

As i lost time in this steps, I simply wanted to let you know that on fedora 15, i needed to install it in
/usr/share/gtksourceview-3.0/language-specs

Hopefully, there is only a little change, about the version number.
But this is very frustrating because i initially do have both folders... gtksourceview-2.0 and gtksourceview-3.0

I don't know why it is different on fedora 15, maybe you could update the doc about that.

I can now get to work !

Bye, and thanks for software