[doc/architecture/payment] remove comments

doc/src/architecture/payment/token_id.md

@@ -1,8 +1,7 @@
 # Token Id
 
-each token has unique token id derived as:
+each token has unique token id derived as
+
 $$ hash(PREFIX || key^{public}_x || key^{public}_y) $$
-`key` is authority key, or public key.
 
-%# validate unique id
-%validate newly minted tokens doesn't match any token mint transaction's token Id.
+`key` is authority key, or public key.