[docs] [issue20135] FAQ need list mutation answers

[R. David Murray]

R. David Murray added the comment:

I think the example would be clarified by speaking about mutation operations versus non-mutation operations.  After all:

>>> x = [1]
>>> y = x
>>> x = x + [2]
>>> x
[1, 2]
>>> y
[1]

At that point including a list += operation would also be beneficial.

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