Update the examples in String
and VecDeque::retain
#87574
Merged
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The examples added in #60396 used a "clever" post-increment hack,
unrelated to the actual point of the examples. That hack was found
confusing in the users forum, and #81811 already changed the
Vec
example to use a more direct iterator. This commit changes
String
andVecDeque
in the same way for consistency.