* changes:
docs: clarify how ^ works for -E/-f installables
docs: give translation examples from nix-build -E/-A to installables
docs: clarify how the different kinds of installables are selected
docs: guide to installables docs in installable commands' docs
The installables syntax is not documented in any of the man pages or
docbook pages for any of those individual commands. And while these
commands really should at least peripherally individually document how
installables work, in the meantime we can at least direct people to the
right place.
This commit also clarifies the unexpected fact that `nix profile remove`
and `nix profile upgrade` do *not* take installables.
Change-Id: I3b1453cb197a613bbab639c66a466365c3592c6d
