Minor doc cleanups.

Here's a grab bag of trivial cleanup to the documentation.  This change:

- Cleans up some comments in the asciidoctor macros which are no longer
  accurate (and do not appear in the build products anyway).

- Fixes a missing space in the text "Wireshark Q&A" in the release notes.

- Allows the "docbook" backend to produce hyperlinks too... That seems to be
  necessary if we want to start using our custom link macros in WSDG, which
  seems like a reasonable thing to do.  And fixes up a wrong variable name in
  the handling of the case where we are not able to produce a hyperlink.

docbook/asciidoctor-macros/cveidlink-inline-macro/extension.rb

@@ -3,7 +3,8 @@ require 'asciidoctor/extensions' unless RUBY_ENGINE == 'opal'
 
 include ::Asciidoctor
 
-# An inline macro that generates links to related man pages.
+# An inline macro that generates a link to a CVE Record identified by its CVE
+# Number.
 #
 # Usage
 #

docbook/asciidoctor-macros/ws_utils.rb

@@ -1,13 +1,13 @@
 # SPDX-License-Identifier: MIT
 module WsUtils
   def create_doc_links(parent, target, text)
-    if parent.document.basebackend? 'html'
+    if (parent.document.basebackend? 'docbook') || (parent.document.basebackend? 'html')
       parent.document.register :links, target
       create_anchor(parent, text, type: :link, target: target).render.to_s
     elsif parent.document.backend == 'manpage'
       "\\fB#{text}"
     else
-      bugtext
+      text
     end
   end
 end

docbook/asciidoctor-macros/wsbuglink-inline-macro/extension.rb

@@ -3,7 +3,7 @@ require 'asciidoctor/extensions' unless RUBY_ENGINE == 'opal'
 
 include ::Asciidoctor
 
-# An inline macro that generates links to related man pages.
+# An inline macro that generates a link to a Wireshark bug report.
 #
 # Usage
 #

docbook/asciidoctor-macros/wssalink-inline-macro/extension.rb

@@ -3,7 +3,7 @@ require 'asciidoctor/extensions' unless RUBY_ENGINE == 'opal'
 
 include ::Asciidoctor
 
-# An inline macro that generates links to related man pages.
+# An inline macro that generates a link to a Wireshark Security Advisory.
 #
 # Usage
 #