documentation outdated on config options?

[KiaraGrouwstra]

hi there,
in the hashicorp docs for this plugin i see an example mentioning a singularity_path setting, which i also see mentioned in #41 here.

now, when i try to set this i am met with an error:

No argument or block type is named "singularity_path"

to be fair, given the source code i don't see support for such a setting at present either, tho that makes me wonder what happened given it appeared to be documented before.

for context, i am running NixOS which changes a bunch of default paths, for which i would prefer to have such a setting to point to the binary (to prevent workarounds involving symlinks).