docs: `lxc list` web-based documentation has broken/unreadable layout

[rptb1]

The web page at https://documentation.ubuntu.com/lxd/en/latest/reference/manpages/lxc/list/ has a broken layout compared to the output of lxc help list though they are clearly from the same source.

Web:

Textual output of lxc help list:

  Pre-defined column shorthand chars:
    4 - IPv4 address
    6 - IPv6 address
    a - Architecture
    b - Storage pool
    c - Creation date
    d - Description
    D - disk usage
    e - Project name
    l - Last used date
    m - Memory usage
    M - Memory usage (%)
    n - Name
    N - Number of Processes
    p - PID of the instance's init process
    P - Profiles
    s - State
    S - Number of snapshots
    t - Type (persistent or ephemeral)
    u - CPU usage (in seconds)
    L - Location of the instance (e.g. its cluster member)
    f - Base Image Fingerprint (short)
    F - Base Image Fingerprint (long)

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Reported from: https://documentation.ubuntu.com/lxd/en/latest/reference/manpages/lxc/list/

[github-actions[bot]]

Heads up @mionaalex - the "Documentation" label was applied to this issue.