update items example to send data through the pipeline (#10976)

# Description

This PR updates the `items` example so that it doesn't use `echo`.
`echo` now works like print unless it's being redirected, so it doesn't
send values through the pipeline anymore like the example showed.

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crates/nu-command/src/filters/items.rs

@@ -123,8 +123,7 @@ impl Command for Items {
 
     fn examples(&self) -> Vec<Example> {
         vec![Example {
-            example:
-                "{ new: york, san: francisco } | items {|key, value| echo $'($key) ($value)' }",
+            example: "{ new: york, san: francisco } | items {|key, value| $'($key) ($value)' }",
             description: "Iterate over each key-value pair of a record",
             result: Some(Value::list(
                 vec![