Update "Tagging" link

[tordans]

Currently the link on the bottom right links to https://wiki.openstreetmap.org/wiki/Key:parking:lane.

A better page ist now https://wiki.openstreetmap.org/wiki/Street_parking.

[zlant]

Fixed https://github.com/zlant/parking-lanes/commit/e9429193b738eaeb2dee144b6042d6e5deb067ae