cue: add more godoc links
I was looking at some of the deprecation notices
and it took me a bit of effort to find the referenced APIs.
Use godoc links so they are trivial to find.
While here, I noticed that hiddenValue.Value referenced a missing type,
which seems to have been a mistake when InstanceOrValue was added.
Also add a note to Instance about it being phased out,
which was documented in its constructors, but not the type itself.
We don't want to deprecate the type right away,
as it's still used in some of our user-facing APIs.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: Ibb1b7de6a1e4a27f4417158559d5857014d922c0
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1171218
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Roger Peppe <rogpeppe@gmail.com>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>