The page indicates that there is not function for documentation in common lisp, but (documentation 'documentation 'function) "Return the documentation

The page indicates that there is not function for documentation in common lisp, but (documentation 'documentation 'function) "Return the documentation string of Doc-Type for X, or NIL if none exists. System doc-types are VARIABLE, FUNCTION, STRUCTURE, TYPE, SETF, and T. Also http://rosettacode.org for computer tasks implemented in many computer languages to allow you compare syntax and code.