Let "systemctl help" command work

Before this change, issuing either
    systemctl --user help syncthing[.service]
or
    systemctl help syncthing@user[.service]
gave the message
    Can't show: http://docs.syncthing.net/

Following this change the syncthing man page is displayed
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f