Enhancements in help message and bash completions

[sshedi]

No description provided.

[oliverkurth]

I still see a few misalignments:

...
--refresh                  Refresh repository metadata before operation
                            Example: tdnf --refresh install package
...
--sec-severity <level>     Filter by security severity (Critical|Important|Moderate|Low)
                           Example: tdnf updateinfo --sec-severity=Critical
--security                  Only show security updates
                            Example: tdnf --security update
--setopt <option>=<value>  Set configuration option
                            Example: tdnf --setopt=keepcache=1 install package
--skip-broken              Skip packages with broken dependencies
                           Example: tdnf --skip-broken install pkg

There are more, just check.

Typo also:

--download-path <dir>      Directory to download packages to
                            Exampl tdnf reposync --download-path=/mnt/repo

I will install it also, to see if tab completion works as expected.

[sshedi]

Thanks for the review. Fixed everything I caught, PTAL again.