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Improving std::env docs Addresses #29351. Hopefully this addresses the following points: > - iterators should use the standard iterator boilerplate like https://doc.rust-lang.org/std/iter/struct.Map.html, this applies to all structs except for JoinPathsError > - JoinPathsError should properly link the function it comes from and use language similar to https://doc.rust-lang.org/std/io/struct.Error.html > - same wording issues with VarError > - functions need to ensure linkage to things they refer to in their descriptions > - Explain the difference between `os` and non-`os` structs and methods