[3.12] gh-106232: Make timeit doc command lines compatible with Windows. (GH-106296) (#106298)

gh-106232: Make timeit doc command lines compatible with Windows. (GH-106296)

Command Prompt (CMD Shell) and older versions of PowerShell
require double quotes and single quotes inside the string.
This form also works on linux and macOS.
(cherry picked from commit 04dfc6fa9018e92a5b51c29fc0ff45419c596bc3)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>