Improve BIP-341 wording

Reading the spec closely the different language used for serialization of input outpoints and input amounts was
confusing on first read. This change uses the same language
for both, which makes it easier to read.

Author: raphjaph

bip-0341.mediawiki

@@ -105,7 +105,7 @@ If the parameters take acceptable values, the message is the concatenation of th
 ** ''nLockTime'' (4): the ''nLockTime'' of the transaction.
 ** If the ''hash_type & 0x80'' does not equal <code>SIGHASH_ANYONECANPAY</code>:
 *** ''sha_prevouts'' (32): the SHA256 of the serialization of all input outpoints.
-*** ''sha_amounts'' (32): the SHA256 of the serialization of all spent output amounts.
+*** ''sha_amounts'' (32): the SHA256 of the serialization of all input amounts.
 *** ''sha_scriptpubkeys'' (32): the SHA256 of all spent outputs' ''scriptPubKeys'', serialized as script inside <code>CTxOut</code>.
 *** ''sha_sequences'' (32): the SHA256 of the serialization of all input ''nSequence''.
 ** If ''hash_type & 3'' does not equal <code>SIGHASH_NONE</code> or <code>SIGHASH_SINGLE</code>: