Update EDE documentation (bug #11441).
* doc/misc/ede.texi (Creating a project): Make ede-new doc less
specific, and only about items it supports, indicating that there
might be more. Remove refs to simple project and direct automake
from ede new.
(Simple projects): Re-write to not talk about ede-simple-project
which is deprecated, and instead use the term to mean projects
that don't do much management, just project wrapping. Add
ede-generic-project link.
(ede-generic-project): New node (bug#11441).