[docs] remove some out-of-date content in LLVM Programmer's Manual. #119565
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Remove the part about implicit conversion from an iterator to a pointer.
This part of the manual was written 14 years ago, in: 37027c3
There do exist a type casting operator in
ilist
then:llvm-project/llvm/include/llvm/ADT/ilist.h
Lines 192 to 194 in 37027c3
But it has been remove since 2016: f197b1f
So I think it makes sense to remove this part to avoid mislead new contributors.