Specify Python Cookbook edition for reference (GH-26301)

The timeit doc references Tim Peters introduction to the Chapter 18,
Algorithms, of the second edition.  The first editiion was before timeit.
The third edition instead has Chapter 1, Data Structures and Algorithms,
without Tim's introduction.

Author: terryjreedy

Doc/library/timeit.rst

@@ -15,8 +15,8 @@
 This module provides a simple way to time small bits of Python code. It has both
 a :ref:`timeit-command-line-interface` as well as a :ref:`callable <python-interface>`
 one.  It avoids a number of common traps for measuring execution times.
-See also Tim Peters' introduction to the "Algorithms" chapter in the *Python
-Cookbook*, published by O'Reilly.
+See also Tim Peters' introduction to the "Algorithms" chapter in the second
+edition of *Python Cookbook*, published by O'Reilly.
 
 
 Basic Examples