[v9_9] some release notes updates

mention that the document summarizes "significant" changes
since obviously it misses a lot.
Also refer to the CHANGES file.

Added a few bugs. Wording some discussed via email, phone call, and jabber.

doc/arm/notes.xml

@@ -21,9 +21,13 @@
   <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="noteversion.xml"/>
   <section xml:id="relnotes_intro"><info><title>Introduction</title></info>
     <para>
-      This document summarizes changes since the last production release
-      of BIND on the corresponding major release branch.
+      This document summarizes significant changes since the last
+      production release of BIND on the corresponding major release
+      branch.
+      Please see the CHANGES file for a further list of bug fixes and
+      other changes.
     </para>
+
   </section>
 
   <section xml:id="relnotes_download"><info><title>Download</title></info>
@@ -169,11 +173,24 @@
 
   <section xml:id="relnotes_bugs"><info><title>Bug Fixes</title></info>
     <itemizedlist>
+      <listitem>
+	<para>
+	  rndc flushtree now works even if there wasn't a cached node at the 
+	  specified name. [RT #41846]
+	</para>
+      </listitem>
+      <listitem>
+	<para>
+	  Don't emit records with zero TTL unless the records were
+	  received with a zero TTL. After being returned to waiting
+	  clients, the answer will be discarded from the cache. [RT #41687]
+	</para>
+      </listitem>
       <listitem>
 	<para>
 	  When deleting records from a zone database, interior nodes
 	  could be left empty but not deleted, damaging search
-	  performance afterward. [RT #40997]
+	  performance afterward. [RT #40997] [RT #41941]
 	</para>
       </listitem>
       <listitem>