Review and finalize the DNF vs DNF5 changes documentation page

[jan-kolarik]

Focusing mainly on the CLI part.

• --version difference (from Document --version option #1337)
• short options not working with = (from dnf5 -x=dnf install dnf does not work as expected #1353)
• Document changes in dnf5-plugin-automatic files between DNF 4 and 5 #1289

Doc pages here: https://dnf5.readthedocs.io/en/latest/changes.html.

[jan-kolarik]

Also we should think about generalizing the current dnf4 vs dnf5 changes doc section to include also details how the systems using dnf4 will migrate to dnf5, like explicitly describing if there are any manual steps they can take to preserve existing configuration or system state, what is done automatically, what is not supported, etc.

[jan-kolarik]

Also we should think about generalizing the current dnf4 vs dnf5 changes doc section to include also details how the systems using dnf4 will migrate to dnf5, like explicitly describing if there are any manual steps they can take to preserve existing configuration or system state, what is done automatically, what is not supported, etc.

I have moved this to a separate ticket: #1739.