Improve doc about map_clone
#6340
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☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test |
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A follow up of #6239 (comment).
map_cloneworks with not onlyIteratorbutOptionalthough not written in doc. Also, an example in the doc shows a usage of dereferencing, but this isn't also written.changelog: Improve doc about
map_clone