Edited ch12_mining.adoc with Atlas code editor

ch12_mining.adoc

@@ -545,7 +545,7 @@ the miners, as we will see next.
 [[duplicate_transactions]]
 ==== Coinbase Data
 
-Coinbase transactions do
+Coinbase ((("coinbase data")))transactions do
 not have an input script field. Instead, this
 field is replaced by coinbase data, which must be between 2 and 100
 bytes. Except for the first few bytes, the rest of the coinbase data can