Fix example for hide-env (#14013)

# Description
Fix example in documentation for hide-env

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crates/nu-cmd-lang/src/core_commands/hide_env.rs

@@ -63,7 +63,7 @@ impl Command for HideEnv {
     fn examples(&self) -> Vec<Example> {
         vec![Example {
             description: "Hide an environment variable",
-            example: r#"$env.HZ_ENV_ABC = 1; hide-env HZ_ENV_ABC; 'HZ_ENV_ABC' in (env).name"#,
+            example: r#"$env.HZ_ENV_ABC = 1; hide-env HZ_ENV_ABC; 'HZ_ENV_ABC' in $env"#,
             result: Some(Value::test_bool(false)),
         }]
     }