Add missing cxl# contextlib alias

Author: gilch

src/hissp/macros.lissp

@@ -1228,6 +1228,7 @@ Hidden doctest adds bundled macros for REPL-consistent behavior.
 
 ;; Less commonly used in Python, but especially useful in Lissp.
 (alias bn builtins.)
+(alias cxl contextlib.)
 (alias cxv contextvars.)
 (alias fi fileinput.)
 (alias imp importlib.)
@@ -3293,7 +3294,7 @@ Hidden doctest adds bundled macros for REPL-consistent behavior.
   ;; --------------
   ;; .. code-block:: REPL
   ;;
-  ;;    #> :@##contextlib..contextmanager
+  ;;    #> :@##cxl#contextmanager
   ;;    #..(defun wrap (msg)
   ;;    #..  (print "enter" msg)
   ;;    #..  (Ensue (lambda (step)
@@ -3382,7 +3383,7 @@ Hidden doctest adds bundled macros for REPL-consistent behavior.
   ;;    exit A
   ;;
   ;;    #> (define suppress-zde
-  ;;    #..  (contextlib..contextmanager
+  ;;    #..  (cxl#contextmanager
   ;;    #..   (lambda :
   ;;    #..     (Ensue (lambda (step)
   ;;    #..              (attach step :