fix(docs): correct url for template download in container resource example

[seankoneill]

Contributor's Note

• I have added / updated documentation in /docs for any user-facing features or additions.
• I have added / updated acceptance tests in /fwprovider/tests for any new or updated resources / data sources.
• I have ran make example to verify that the change works as expected.

Description

#837 Changed the example container template url from:
http://download.proxmox.com/images/system/ubuntu-20.04-standard_20.04-1_amd64.tar.gz
to:
https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64.tar.gz.

The latter is a QCOW v2 image, so following the example as it's currently written will create a container that doesn't start: __lxc_start: 2114 Failed to spawn container "1234".

This PR just undoes this change in the docs so that following the example for the proxmox_virtual_environment_container resource works as expected.

Community Note

• Please vote on this pull request by adding a 👍 reaction to the original pull request comment to help the community and maintainers prioritize this request
• Please do not leave "+1" or other comments that do not add relevant new information or questions, they generate extra noise for pull request followers and do not help prioritize the request

Closes #0000 | Relates #0000

[bpg]

Thanks for the fix @seankoneill, good catch!

LGTM! 🚀

[bpg]

@all-contributors please add @seankoneill for docs

[allcontributors]

@bpg

I've put up a pull request to add @seankoneill! 🎉