Differences from `urfave/cli/v2` to `v3`: `DefaultText`, `cli.StringSlice` and quotes

[enrichman]

While migrating from urfave/cli/v2 to v3 I have found few differences in the generated docs.

DefaultText

I have a cli.StringFlag with a DefaultText (default text of the flag for usage purposes):

&cli.StringFlag{
	Name:        "kubeconfig",
	Usage:       "kubeconfig path",
	Destination: &appCtx.Kubeconfig,
	DefaultText: "$HOME/.kube/config or $KUBECONFIG if set",
}

Is it expected?

cli.StringSlice

Moving from the cli.StringSlice to the []string is adding the empty slice as default:

// v2
**--agent-args**="": agents extra arguments

// v3
**--agent-args**="": agents extra arguments (default: [])

quotes

Quotes for the default strings are missing:

// v2
**--mode**="": k3k mode type (shared, virtual) (default: "shared")

// v3
**--mode**="": k3k mode type (shared, virtual) (default: shared)