Merge pull request jsonwebtoken#368 from jsonwebtoken/fix/wrong-wording

Change wrong/confusing wording in the introduction

Author: Sambego

views/website/md/introduction.md

@@ -27,7 +27,7 @@ Let's break down the different parts.
 
 ### Header
 
-The header *typically* consists of two parts: the type of the token, which is JWT, and the hashing algorithm being used, such as HMAC SHA256 or RSA.
+The header *typically* consists of two parts: the type of the token, which is JWT, and the signing algorithm being used, such as HMAC SHA256 or RSA.
 
 For example: