[tz] Duplicated shell commands on the tz-link.html IANA page

Hi, Some time ago I have noticed that shell commands are duplicated in the "Downloading the tz database" section on the following page https://data.iana.org/time-zones/tz-link.html#download

mkdir tzdb cd tzdb wget https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz wget https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz gzip -dc tzcode-latest.tar.gz | tar -xf - gzip -dc tzdata-latest.tar.gz | tar -xf -

I think it is better to remove some commands.