Edited ch09_fees.adoc with Atlas code editor

ch09_fees.adoc

@@ -212,7 +212,7 @@ transaction to pay a higher total fee than the original transaction, but
 this requirement has undesired side effects and developers have been
 looking for ways to remove it at the time of writing.
 
-Bitcoin Core((("Bitcoin Core", "RBF variants"))) currently supports two variations of RBF:
+Bitcoin Core((("Bitcoin Core", "RBF variants", id="bitcoin-core-rbf"))) currently supports two variations of RBF:
 
 Opt-in RBF::
   An unconfirmed transaction can signal to miners and full nodes that
@@ -283,7 +283,7 @@ added an option that allows users to enable full RBF.  If enough mining
 hash rate and relaying full nodes enable this option, it will be
 possible for any unconfirmed transaction to eventually be replaced by a
 version paying a higher fee rate.  As of this writing, it's not clear
-whether or not that has happened yet.
+whether or not that has happened ((("Bitcoin Core", "RBF variants", startref="bitcoin-core-rbf")))yet.
 ****
 
 As a user, if you plan to use RBF fee bumping, you will first need to