wiimenu, wmiiSnap, libixp_for_wmii: removed, fixes #9609

wiimenu superseded by wimenu from wmii
wmiiSnap superseded by wmii_hg
libixp_for_wmii superseded by libixp_hg

nixos/doc/manual/release-notes/release-notes.xml

@@ -9,6 +9,7 @@
 <para>This section lists the release notes for each stable version of NixOS
 and current unstable revision.</para>
 
+<xi:include href="rl-unstable.xml" />
 <xi:include href="rl-1509.xml" />
 <xi:include href="rl-1412.xml" />
 <xi:include href="rl-1404.xml" />

nixos/doc/manual/release-notes/rl-unstable.xml

@@ -0,0 +1,27 @@
+<section xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xmlns:xi="http://www.w3.org/2001/XInclude"
+         version="5.0"
+         xml:id="sec-release-unstable">
+
+<title>Unstable</title>
+
+<para>When upgrading from a previous release, please be aware of the
+  following incompatible changes:
+
+  <itemizedlist>
+    <listitem><para>
+        <command>wmiiSnap</command> has been replaced with
+        <command>wmii_hg</command>, but
+        <command>services.xserver.windowManager.wmii.enable</command>
+        has been updated respectively so this only affects you if you
+        have explicitly installed <command>wmiiSnap</command>.
+    </para></listitem>
+    <listitem><para>
+        <command>wmiimenu</command> is removed, as it has been removed by
+        the developers upstream. Use <command>wimenu</command> from the
+        <command>wmii-hg</command> package.
+    </para></listitem>
+  </itemizedlist>
+</para>
+</section>