DOC Add entry to solve unknown config argument (#2340)
There have been multiple issues and forum posts in the past asking about
errors like:
TypeError: LoraConfig.__init__() got an unexpected keyword argument ...
This error can occur when the adapter that is being loaded is trained
with a more recent PEFT version than the one currently being used. I
thus added a section to the Troubleshooting part of our docs to describe
the solutions.
Note that we already added changes to PEFT in #2038 to make configs
forward compatible. But since users who encounter this problem have, by
definition, older PEFT versions, they don't benefit from this.
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
