Make Block Issuer Feature requirement syntactic

tips/TIP-0042/tip-0042.md

@@ -360,6 +360,7 @@ which they were selected to participate in the validator committee.
 ### Additional Transaction Syntactic Validation Rules
 
 - The `Amount` in the containing account output satisfies `Amount >= Staked Amount`.
+- A _Block Issuer Feature_ must be present in the account.
 - A _Commitment Input_ must be present in the transaction.
 
 ### Additional Transaction Semantic Validation Rules
@@ -371,9 +372,6 @@ which they were selected to participate in the validator committee.
 - When a _Staking Feature_ is present in an account output on the input side of a transaction, the transaction that
   contains this output is valid only if:
   - A _Commitment Input_ is present.
-- When a _Staking Feature_ is present in an account output on the output side of a transaction, the transaction that
-  contains this output is valid only if all of the following conditions hold:
-  - A _Block Issuer Feature_ must be present in the account.
 - When a _Staking Feature_ is present in an account output on the output side of a transaction and the feature was not
   present on the input side, the transaction that contains this output is valid only if all of the following conditions
   hold: