docs: Update faq.md (#2458)

Author: cobrexus

www/docs/faq.md

@@ -206,7 +206,7 @@ JSON Web Tokens can be used for session tokens, but are also used for lots of ot
 
   Avoid storing any data in a token that might be problematic if it were to be decrypted in the future.
 
-* If you do not explicitly specify a secret for for NextAuth.js, existing sessions will be invalidated any time your NextAuth.js configuration changes, as NextAuth.js will default to an auto-generated secret.
+* If you do not explicitly specify a secret for NextAuth.js, existing sessions will be invalidated any time your NextAuth.js configuration changes, as NextAuth.js will default to an auto-generated secret.
 
   If using JSON Web Token you should at least specify a secret and ideally configure public/private keys.