[docs] [issue30826] More details in reference 'Looping through a list in Python and modifying it'

[Anmol Gupta]

New submission from Anmol Gupta:

Documentation section: https://docs.python.org/3/reference/compound_stmts.html#for

The documentation does not explain at all why is there an infinite loop when not using a copy of the list.

It leaves the reader in a confused state.

Even there are questions concerning the same on stackoverlflow: https://stackoverflow.com/questions/44633798/loop-through-a-list-in-python-and-modify-it

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