docs: fix comment

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---

Author: kgryte

lib/node_modules/@stdlib/math/array/tools/README.md

@@ -85,7 +85,7 @@ var x = [ -1.0, 2.0, -3.0, 4.0 ];
 
 // Perform element-wise computation:
 var out = f.apply( x );
-// returns [ 1.0, 2.0, 3.0, 4.0]
+// returns [ 1.0, 2.0, 3.0, 4.0 ]
 ```
 
 </section>