Just to make sure I'm not confusing things: the three different assignments in the "Configuration" section of http://github.com/Olical/conjure are not supposed to be run one right after another, but they are just three separate examples? And the fourth assignment is the VimScript alternative to the first one?
-- Disable the documentation mapping
vim.g["conjure#mapping#doc_word"] = false
-- Rebind it from K to <prefix>gk
vim.g["conjure#mapping#doc_word"] = "gk"
-- Reset it to the default unprefixed K (note the special table wrapped syntax)
vim.g["conjure#mapping#doc_word"] = {"K"}