Manpages: `podman network connect` missing example with `--mac-address` option

[mheon]

The --mac-address option is not shown in an example in the podman network connect manpage - we should fix this by including an example.

[Luap99]

/assign shu-kitamura

[openshift-ci]

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In response to this:

/assign shu-kitamura

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[shu-kitamura]

/assign