provisioner/habitat: add missing space for service url

fix spacing for service url.

Based on some feedback on the initial draft, make some minor updates to
how information is presented in the preview upgrade guide for v0.12.

This also includes some minor copy-editing work to try to make the "voice"
more consistent between different sections of the guide.

svchost/disco: make sure to close the response body

And fix a few linter warnings while we're at it…

This module now gets the region from the inherited provider block.

Add 0.12 upgrade guide

cli: fix tests

After some discussion with "iamakulov" on Twitter it seems that the use
of the word "conflicts" and "merge conflicts" here was sounding like us
implicitly condoning the use of version control as a mechanism for
distributing local state files, which hasn't been recommended for quite
some time since remote state now provides a much more robust solution.

While here, I also tweaked some other language on this page for style and
for use of terminology we more commonly use in our more recent
documentation.

Following the examples as they were previously would cause errors
accessing demo.consul.io. Now we consistently set the scheme to https for
all examples that use demo.consul.io.

This also includes some other updates to the URLs, since the Consul demo
has been rebuilt with a different based configuration, and some general
formatting and copyediting changes in the Consul example.

Add AzureStack documentation links

Export resource deprecation.

At the Enablement team's request, change from using `Deprecated` to
`DeprecationMessage`, as it's a string value, not a boolean.

- Fixes #11696
- This changes makes `terraform output -json` return '{}' instead of
  throwing an error about "no outputs defined"
- If `-json` is not set, the user will receive an error as before
  - This UX helps new users to understand how outputs are used
- Allows for easier automation of TF CLI as an empty set of outputs is
  usually acceptable, but any other error from `output` would be
  re-raised to the user.

* cli: show workspace name in destroy confirmation

If the workspace name is not "default", include it in the confirmation
message for `terraform destroy`.

Fixes #15480

We already had the functionality to make resources deprecated, which was
used when migrating resources to data sources, but the functionality was
unexported, so only the schema package could do it. Now it's exported,
meaning providers can mark entire resources as deprecated. I also added
a test in hopefully-the-right place?

Add a HashInt helper/schema function

should be provides, not provies

should be maximum not maxiumum

Due to an incorrect slice allocation, the environment variable list was created with an empty string
element for each real element added.

It appears that this was silently ignored on Unix, but caused the following environment settings
to be ignored altogether on Windows.

Fix broken links to /docs/enterprise/run/api.html

We had a couple broken links pointing to the docs for the run API. This
updates them to the new location.

The example for parsing multiple providers to a module had quotation marks around the keys. This does not seem to be the correct format