Documentation for Installing on Synology

[Cautious-Software701]

I believe that the documentation on https://github.com/jellyfin/jellyfin-docs/blob/master/general/administration/install/synology.md is outdated.

It seems that you can no longer install the jellyfin image from the registry because isntead of being prompted to select the tag/ version it instead constantly loads until it times out. From doing some research it seems that it could be because there are too many tags and Synology cannot handle them.