docs: update juju tutorial to use version 3.0 instead of 2.9

[jat-canonical]

This commit updates the docs for new users to start with juju 3.0 as that is the gold standard to use right with new features being developed as a priority for it.

[keirthana]

There's also one more specific scenario of mentioning architecture for Juju 2.9.0 in that topic. Should we change that to align with Juju 3.0? See https://documentation.ubuntu.com/anbox-cloud/en/latest/howto/install/deploy-juju/#use-arm-instances

[jat-canonical]

There's also one more specific scenario of mentioning architecture for Juju 2.9.0 in that topic. Should we change that to align with Juju 3.0? See https://documentation.ubuntu.com/anbox-cloud/en/latest/howto/install/deploy-juju/#use-arm-instances

I had intentionally left that in for people who might have a need to run 2.9 or 3.x as it was just extra information.

[keirthana]

There's also one more specific scenario of mentioning architecture for Juju 2.9.0 in that topic. Should we change that to align with Juju 3.0? See https://documentation.ubuntu.com/anbox-cloud/en/latest/howto/install/deploy-juju/#use-arm-instances

I had intentionally left that in for people who might have a need to run 2.9 or 3.x as it was just extra information.

Okay, if there will be some users who will want to stick with 2.9, it is worth keeping it. Thanks for clarifying