Error: custom-declare-variable: Doc string is missing

[jethrokuan]

Upon upgrading inf-clojure, this error shows up when running inf-clojure:

custom-declare-variable: Doc string is missing

I believe this is due to the latest commit here.

The offending lines are here, where inf-clojure-macroexpand-command and inf-clojure-macroexpand-1-command require docstrings.

Would be happy to do a PR, but I'm not sure what to name docstring to give them.