#14097: merge with 3.3.

diff --cc Misc/NEWS
index da81c3b0bf349fe734539883a8eee85f9577e939,5d9494781fe3963a755df8c4cf88c394947327f1..1c54d33f5c99e55796bdb6a696873a867cc80151
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -323,9 -283,6 +323,11 @@@ Test
  Documentation
  -------------
  
++- Issue #14097: improve the "introduction" page of the tutorial.
++
 +- Issue #17977: The documentation for the cadefault argument's default value
 +  in urllib.request.urlopen() is fixed to match the code.
 +
  - Issue #15940: Specify effect of locale on time functions.
  
  - Issue #6696: add documentation for the Profile objects, and improve