doc: state correct default behaviour of VTYSH_PAGER env if unset (vtysh manpage) #18691
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Modified section about environment variable VTYSH_PAGER in manpage about vtysh to reflect the default configuration for this env as described inside the FRR User Docs (https://docs.frrouting.org/en/latest/vtysh.html#envvar-VTYSH_PAGER)