nixos/zookeeper: Update doc with suggested description

nixos/doc/manual/from_md/release-notes/rl-2205.section.xml

@@ -1311,9 +1311,10 @@
         <para>
           <literal>services.zookeeper</literal> has a new option
           <literal>jre</literal> for specifying the JRE to start
-          zookeeper with. It defaults to the JRE built with
-          <literal>pkgs.zookeeper</literal> instead of
-          <literal>pkgs.jre</literal>.
+          zookeeper with. It defaults to the JRE that
+          <literal>pkgs.zookeeper</literal> was wrapped with, instead of
+          <literal>pkgs.jre</literal>. This changes the JRE to
+          <literal>pkgs.jdk11_headless</literal> by default.
         </para>
       </listitem>
       <listitem>

nixos/doc/manual/release-notes/rl-2205.section.md

@@ -519,8 +519,8 @@ In addition to numerous new and upgraded packages, this release has the followin
   commands from `otelcontribcol` to `otelcorecol` and enjoy a 7x smaller binary.
 
 - `services.zookeeper` has a new option `jre` for specifying the JRE to start
-  zookeeper with. It defaults to the JRE built with `pkgs.zookeeper` instead of
-  `pkgs.jre`.
+  zookeeper with. It defaults to the JRE that `pkgs.zookeeper` was wrapped with,
+  instead of `pkgs.jre`. This changes the JRE to `pkgs.jdk11_headless` by default.
 
 - `pkgs.pgadmin` now refers to `pkgs.pgadmin4`. `pgadmin3` has been removed.