Rollup merge of #125206 - mgeisler:simplify-std-env-vars, r=jhpratt,tgross35

Simplify environment variable examples

I’ve found myself visiting the documentation for `std::env::vars` every few months, and every time I do, it is because I want to quickly get a snippet to print out all environment variables :-)

So I think it could be nice to simplify the examples a little to make them self-contained. It is of course a style question if one should import a module a not, but I personally don’t import modules used just once in a code snippet.

library/std/src/env.rs

@@ -120,11 +120,8 @@ pub struct VarsOs {
 /// # Examples
 ///
 /// ```
-/// use std::env;
+/// // Print all environment variables.
-///
+/// for (key, value) in std::env::vars() {
-/// // We will iterate through the references to the element returned by
-/// // env::vars();
-/// for (key, value) in env::vars() {
 ///     println!("{key}: {value}");
 /// }
 /// ```
@@ -150,11 +147,8 @@ pub fn vars() -> Vars {
 /// # Examples
 ///
 /// ```
-/// use std::env;
+/// // Print all environment variables.
-///
+/// for (key, value) in std::env::vars_os() {
-/// // We will iterate through the references to the element returned by
-/// // env::vars_os();
-/// for (key, value) in env::vars_os() {
 ///     println!("{key:?}: {value:?}");
 /// }
 /// ```