help: add internals.wireprotocolv2 to the table, and remove redundant header

mercurial/help.py

@@ -219,6 +219,8 b' internalstable = sorted(['
      loaddoc('revlogs', subdir='internals')),
     (['wireprotocol'], _('Wire Protocol'),
      loaddoc('wireprotocol', subdir='internals')),
+    (['wireprotocolv2'], _('Wire Protocol Version 2'),
+     loaddoc('wireprotocolv2', subdir='internals')),
 ])
 
 def internalshelp(ui):

mercurial/help/internals/wireprotocolv2.txt

@@ -1,6 +1,3 b''
-Wire Protocol Version 2
-=======================
-
 **Experimental and under active development**
 
 This section documents the wire protocol commands exposed to transports

tests/test-help.t

@@ -1017,6 +1017,8 b' internals topic renders index of availab'
        requirements  Repository Requirements
        revlogs       Revision Logs
        wireprotocol  Wire Protocol
+       wireprotocolv2
+                     Wire Protocol Version 2
 
 sub-topics can be accessed
 
@@ -3343,6 +3345,13 b' Sub-topic indexes rendered properly'
   </td><td>
   Wire Protocol
   </td></tr>
+  <tr><td>
+  <a href="/help/internals.wireprotocolv2">
+  wireprotocolv2
+  </a>
+  </td><td>
+  Wire Protocol Version 2
+  </td></tr>