bpo-20823: Clarify copyreg.pickle() documentation (pythonGH-30230)

(cherry picked from commit 65940fa)

Co-authored-by: Kumar Aditya <[email protected]>

Doc/library/copyreg.rst

@@ -33,8 +33,8 @@ Such constructors may be factory functions or class instances.
 
    The optional *constructor* parameter, if provided, is a callable object which
    can be used to reconstruct the object when called with the tuple of arguments
-   returned by *function* at pickling time.  :exc:`TypeError` will be raised if
-   *object* is a class or *constructor* is not callable.
+   returned by *function* at pickling time.  A :exc:`TypeError` is raised if the
+   *constructor* is not callable.
 
    See the :mod:`pickle` module for more details on the interface
    expected of *function* and *constructor*.  Note that the