Reduce MFA introduction repetition

Author: ButterscotchV

src/web-safety/mfa.md

@@ -13,7 +13,7 @@ description: "A guide to setting up multi-factor authentication (MFA)."
 
 # {{ title }}
 
-## Multi-factor authentication (MFA) introduction
+## Introduction
 
 Multi-factor authentication (MFA) is a method of securing your accounts with a short temporary pin alongside your password. By using a temporary pin generated by a secure device, it's much harder for hackers to steal your account.