fixed hc xrefs in preface

meta/third_edition_changes.asciidoc

@@ -3,7 +3,7 @@ second edition text and the remaining 2014 first edition text.  In
 addition, many concepts that are relevant to contempory Bitcoin
 development in 2023 have been added.
 
-Chapter 4::
+<<ch04_keys_addresses>>::
   Rearrange address info so that we work through everything in
   historical order, adding a new section with P2PK (where "address" was "IP
   address"), refresh the previous P2PKH and P2SH sections, and then add new
@@ -12,33 +12,32 @@ Chapter 4::
 Old chapters 6 and 7::
   Text from previous versions of Chapter 6 "Transactions" and Chapter 7
   "Advanced transactions" has been rearranged and expanded across four
-  new chapters: Chapter 6 "Transactions" (the structure of txes), Chapter 7
-  "Authorization and authentication", Chapter 8 "Signatures", and
-  Chapter 9 "Fees".
+  new chapters:  pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#c_transactions">#c_transactions</a>]  (the structure of txes), pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#c_authorization_authentication">#c_authorization_authentication</a>] ,  pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#c_signatures">#c_signatures</a>], and
+   pass:[<a data-type="xref" data-xrefstyle="chap-num-title" href="#tx_fees">#tx_fees</a>].
 
-Chapter 6::
+<<c_transactions>>::
   Almost entirely new text describing the structure of a transaction.
 
-Chapter 7::
+<<c_authorization_authentication>>::
   New text about MAST, P2C, scriptless multisignatures, taproot, and
   tapscript.
 
-Chapter 8::
+<<c_signatures>>::
   Revision of ECDSA text and new text about schnorr signatures,
   multisignatures, and threshold signatures.
 
-Chapter 9::
+<<tx_fees>>::
   Almost entirely new text about fees, RBF and CPFP fee
   bumping, transaction pinning, package relay, and CPFP carve-out.
 
-Chapter 10::
+<<bitcoin_network_ch08>>::
   New text about compact block relay, significant update to bloom
   filters (describe problems), new text about compact block filters.
 
-Chapter 11::
+<<blockchain>>::
   New text about signet.
 
-Chapter 12::
+<<mining>>::
   New text about BIP8 and speedy trial.
 
 Appendixes::