Clarified language to address implementation specific nitpicking in errata #151306

ch05.asciidoc

@@ -96,7 +96,7 @@ What comes first? Inputs or outputs, the chicken or the egg? Strictly speaking,
 
 ((("bitcoin ledger, outputs in", id="ix_ch05-asciidoc2", range="startofrange")))((("transactions","outputs", id="ix_ch05-asciidoc3", range="startofrange")))((("unspent transaction output (UTXO)", id="ix_ch05-asciidoc4", range="startofrange")))Every bitcoin transaction creates outputs, which are recorded on the bitcoin ledger. Almost all of these outputs, with one exception (see <<op_return>>) create spendable chunks of bitcoin called _unspent transaction outputs_ or UTXO, which are then recognized by the whole network and available for the owner to spend in a future transaction. Sending someone bitcoin is creating an unspent transaction output (UTXO) registered to their address and available for them to spend.
 
-UTXO are tracked by every full-node bitcoin client in a database held in memory, called the((("UTXO pool")))((("UTXO set"))) _UTXO set_ or _UTXO pool_. New transactions consume (spend) one or more of these outputs from the UTXO set. 
+UTXO are tracked by every full-node bitcoin client as a data set called the((("UTXO pool")))((("UTXO set"))) _UTXO set_ or _UTXO pool_, held in a database. New transactions consume (spend) one or more of these outputs from the UTXO set. 
 
 Transaction outputs consist of two parts: