Let describe-function work for lambda again

Let describe-function work for lambda again

Since commit "* lisp/help-fns.el (describe-function): More type
checking[...]", `describe-function' throws a user-error when given a
non-symbol.  This prevents the [back] button in a *Help* buffer from
working when the page it goes back to describes an anonymous
function (e.g., the result of `describe-key' on a key which is bound to
a lambda form).

* lisp/help-fns.el (describe-function): Move the checks on FUNCTION
being an fbound symbol into the `interactive' form.  This allows
non-interactive calls to pass an anonymous function (Bug #24221).  Note
that passing a non-bound symbol non-interactively will still trigger a
`void-function' error from `describe-function-1'.