Remove incorrect and bugged inspect_request
Remove incorrect and bugged inspect_request

With the previous code, shift+tab on the notebook runs code silently instead of showing the documentation. It's not the intended function of inspect_request and might create confusion with users.
(according to https://jupyter-client.readthedocs.io/en/latest/messaging.html#introspection )
zalt50/iruby,SciRuby/iruby,zalt50/iruby,SciRuby/iruby,SciRuby/iruby,SciRuby/iruby,zalt50/iruby,zalt50/iruby