Rollup merge of #35758 - matthew-piziak:vec-assert-over-println-remaining, r=Guillaum...

accumulate vector and assert for RangeFrom and RangeInclusive examples

PR #35695 for `Range` was merged, so it seems that this side-effect-free style is preferred for Range* examples. This PR performs the same translation for `RangeFrom` and `RangeInclusive`. It also removes what looks to be an erroneously commented line for `#![feature(step_by)]`, and an unnecessary primitive-type annotation in `0u8..`.