Fix grammar

Author: Daniel

9-regular-expressions/20-regexp-unicode/article.md

@@ -5,7 +5,7 @@ The unicode flag `/.../u` enables the correct support of surrogate pairs.
 
 Surrogate pairs are explained in the chapter <info:string>.
 
-Let's briefly remind them here. In short, normally characters are encoded with 2 bytes. That gives us 65536 characters maximum. But there are more characters in the world.
+Let's briefly review them here. In short, normally characters are encoded with 2 bytes. That gives us 65536 characters maximum. But there are more characters in the world.
 
 So certain rare characters are encoded with 4 bytes, like `𝒳` (mathematical X) or `😄` (a smile).