There should be a link to the argument being referenced for clarity and completeness.

So far we've only ever needed to re-parse address strings that happen not
to contain instance keys and so we've gotten away with our serialization
of these not being quite right, but given how liberally we've expected to
be able to use address strings from this package for wire format
interchange it seems likely that this is going to surprise us eventually.

Now we'll use an escaping scheme compatible with HCL's parser rather
than Go's parser, and so we can safely rely on hclsyntax.ParseTraversal
as part of reversing this operation to transform an address string back
into an address equivalent to the value it was created from.

docs: Fix a few typos

Call PlanResourceChange for destroy operations

remove go.mod replacement of `github.com/golang/mock`

enable destroy planning for the simple providers used in the e2e tests

This is most easily handled in the plugin code, without involving
Terraform core.

The biggest change here other than checking the PlanDestroy capability,
is the removal of the schema helper methods in the plugins. With the
addition of the capabilities field, combined with the necessity of
checking diagnostics from the schema, the helpers have outlived their
usefulness. Perhaps there's a better pattern for these repetitive calls,
but for now there isn't too extra verbosity involved.

some of the minimal test provider implementations didn't check for null
values.

Call PlanResourceDestroy during a destroy plan.

This allows providers two new abilities:
- They can evaluate if the plan is valid, notifying users of any
  potential errors before an apply is started, which may not be able to
  complete.
- They can inspect and modify their private data during a destroy plan
  just like they can with an other plan operation.

Update README.md

Update docs/cli/commands/init: add backtick to readonly value

Update format function to mention list, map, and null types

remove deprecated etcdv3 backend

Add shell explanation to remote-exec `inline` argument documentation.

Fix Broken CDKTF Link on Terraform Tools page

There are small typos in:
- docs/planning-behaviors.md
- docs/resource-instance-change-lifecycle.md
- website/README.md

Fixes:
- Should read `exhaustive` rather than `exhastive`.
- Should read `representation` rather than `repesentation`.
- Should read `preferably` rather than `preferrably`.
- Should read `absence` rather than `absense`.

Co-authored-by: Laura Pacilio <83350965+laurapacilio@users.noreply.github.com>

Since we've both concluded the module_variables_optional_attrs experiment
and made experiments available only in alpha releases in the same minor
release, we accidentally made the more general message about experiments
not being available mask the specific message about the experiment being
concluded.

In order to give better feedback to those who were participating in the
experiment in earlier Terraform releases, we'll retain a minimal exception
to our checks to allow the "experiment has concluded" error message to
shine through if and only if that is the only selected experiment.

add deprecation notices to backends

Co-authored-by: Laura Pacilio <83350965+laurapacilio@users.noreply.github.com>

Co-authored-by: Laura Pacilio <83350965+laurapacilio@users.noreply.github.com>

Co-authored-by: Laura Pacilio <83350965+laurapacilio@users.noreply.github.com>

Co-authored-by: Laura Pacilio <83350965+laurapacilio@users.noreply.github.com>

Co-authored-by: Laura Pacilio <83350965+laurapacilio@users.noreply.github.com>

Update commands for new Ubuntu version