[docs] [issue13203] Doc: say id() is only useful for existing objects

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0d5de993db66 by Georg Brandl in branch '3.3':
Closes #13203: add a FAQ section about seemingly duplicate id()s.
http://hg.python.org/cpython/rev/0d5de993db66

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