Typo fix

Author: Invariance-NaN

9-regular-expressions/03-regexp-unicode/article.md

@@ -1,6 +1,6 @@
 # Unicode: flag "u" and class \p{...}
 
-JavaScript uses [Unicode encoding](https://en.wikipedia.org/wiki/Unicode) for strings. Most characters are encoding with 2 bytes, but that allows to represent at most 65536 characters.
+JavaScript uses [Unicode encoding](https://en.wikipedia.org/wiki/Unicode) for strings. Most characters are encoded with 2 bytes, but that allows to represent at most 65536 characters.
 
 That range is not big enough to encode all possible characters, that's why some rare characters are encoded with 4 bytes, for instance like `𝒳` (mathematical X) or `😄` (a smile), some hieroglyphs and so on.