#20135: FAQ entry for list mutation.  (See also 6375bf34fff6.)

I accidentally committed this in 6375bf34fff6; this changeset addresses the
last review comments on the patch.

This is a perennial question and something someone opens a ticket for probably
every other month or so, so I'm surprised we didn't already have a FAQ entry
for it.

The original patch was written by M. Votz, refined first by Ezio Melotti and
further refined by me.
Merge: #20135: FAQ entry for list mutation.  (See also 90b07d422bd9.)

I accidentally merged this in 90b07d422bd9; this merge addresses the
last review comments on the patch.
Issue #22510: Get rid of little overhead of testing re.DEBUG flag.
#17442: Add chained traceback support to InteractiveInterpreter.

Patch by Claudiu Popa.