BIP 0070: Fix output use

Author: dancer1325

bip-0070.mediawiki

@@ -55,7 +55,7 @@ The Protocol Buffers messages are defined in [[bip-0070/paymentrequest.proto|pay
 
 ===Output===
 
-Outputs are used in PaymentRequest messages to specify where a payment (or
+Outputs are used in PaymentDetails messages to specify where a payment (or
 part of a payment) should be sent. They are also used in Payment messages
 to specify where a refund should be sent.
 <pre>