Rollup merge of #46548 - jonathanstrong:master, r=dtolnay
Recommends lazily evaluated alternatives for `Option::or` and `Result::or` Adds language to docs for `Option` and `Result` recommending the use of lazily evaluated alternatives when appropriate. These comments are intended to echo a [clippy lint] on the same topic. The [reddit discussion] may also be of interest. [clippy lint]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#or_fun_call [reddit discussion]: https://www.reddit.com/r/rust/comments/7hutqn/perils_of_optionor_and_resultor/
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