http://conky.sourceforge.net/ redirect to https://github.com/brndnmtthws/conky
So I'm not sure it's still maintained.
And their wiki point to the man:
Settings
Settings are used to configure the way Conky looks and behaves. See man -P "less -p 'CONFIGURATION SETTINGS'" conky for a complete list of Conky settings. You can read manual in your browser too: man -H conky.
Variables
Variables are used to make Conky display information. See man -P "less -p 'OBJECTS/VARIABLES'" conky for a complete list of Conky variables. You can read manual in your browser too: man -H conky.