Add reduce spread article to no-array-reduce docs (#1400)

docs/rules/no-array-reduce.md

@@ -1,6 +1,6 @@
 # Disallow `Array#reduce()` and `Array#reduceRight()`
 
-`Array#reduce()` and `Array#reduceRight()` usually [result in hard-to-read code](https://twitter.com/jaffathecake/status/1213077702300852224). In almost every case, it can be replaced by `.map`, `.filter`, or a `for-of` loop. It's only somewhat useful in the rare case of summing up numbers.
+`Array#reduce()` and `Array#reduceRight()` usually result in [hard-to-read](https://twitter.com/jaffathecake/status/1213077702300852224) and [less performant](https://www.richsnapp.com/article/2019/06-09-reduce-spread-anti-pattern) code. In almost every case, it can be replaced by `.map`, `.filter`, or a `for-of` loop. It's only somewhat useful in the rare case of summing up numbers.
 
 Use `eslint-disable` comment if you really need to use it.