Use more idiomatic example (#11251)

* Use more concise example

* Apply suggestions from review

---------

Co-authored-by: Mikey Lombardi (He/Him) <michael.t.lombardi@gmail.com>

reference/7.4/Microsoft.PowerShell.Core/About/about_Arrays.md

@@ -646,7 +646,7 @@ The following example shows how to select all odd numbers from the array.
 The next example shows how to select all non-empty strings.
 
 ```powershell
-('hi', '', 'there').Where({$_.Length})
+('hi', '', 'there').Where{ $_ }
 ```
 
 ```Output