Rollup merge of #25087 - nham:improve_vec_docs, r=Gankro
This commit does two things: it adds an example for indexing vectors, and it changes the \"Examples\" section to use full sentences. This change was spurred by someone in the #rust IRC channel asking if there was a `.set()` method for changing the `i`-th value of a vector (they had missed that `Vec` implements `IndexMut`, which is easy to do if you're not aware of that trait).
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