docs: Move 'timestamps' and 'encryption' sub-element description

The description should be in the target for a volume not a pool.

docs/formatstorage.html.in

@@ -456,24 +456,6 @@
         will be filled with the values used by the existing directory.
         <span class="since">Since 1.2.16</span>
       </dd>
-      <dt><code>timestamps</code></dt>
-      <dd>Provides timing information about the volume. Up to four
-        sub-elements are present,
-        where <code>atime</code>, <code>btime</code>, <code>ctime</code>
-        and <code>mtime</code> hold the access, birth, change and
-        modification time of the volume, where known. The used time
-        format is &lt;seconds&gt;.&lt;nanoseconds&gt; since the
-        beginning of the epoch (1 Jan 1970). If nanosecond resolution
-        is 0 or otherwise unsupported by the host OS or filesystem,
-        then the nanoseconds part is omitted.  This is a readonly
-        attribute and is ignored when creating a volume.
-        <span class="since">Since 0.10.0</span>
-      </dd>
-      <dt><code>encryption</code></dt>
-      <dd>If present, specifies how the volume is encrypted.  See
-        the <a href="formatstorageencryption.html">Storage Encryption</a> page
-        for more information.
-      </dd>
     </dl>
 
     <h3><a name="StoragePoolExtents">Device extents</a></h3>
@@ -658,6 +640,24 @@
         will be filled with the values used by the existing file.
         <span class="since">Since 0.4.1</span>
       </dd>
+      <dt><code>timestamps</code></dt>
+      <dd>Provides timing information about the volume. Up to four
+        sub-elements are present,
+        where <code>atime</code>, <code>btime</code>, <code>ctime</code>
+        and <code>mtime</code> hold the access, birth, change and
+        modification time of the volume, where known. The used time
+        format is &lt;seconds&gt;.&lt;nanoseconds&gt; since the
+        beginning of the epoch (1 Jan 1970). If nanosecond resolution
+        is 0 or otherwise unsupported by the host OS or filesystem,
+        then the nanoseconds part is omitted.  This is a readonly
+        attribute and is ignored when creating a volume.
+        <span class="since">Since 0.10.0</span>
+      </dd>
+      <dt><code>encryption</code></dt>
+      <dd>If present, specifies how the volume is encrypted.  See
+        the <a href="formatstorageencryption.html">Storage Encryption</a> page
+        for more information.
+      </dd>
       <dt><code>compat</code></dt>
       <dd>Specify compatibility level. So far, this is only used for
         <code>type='qcow2'</code> volumes. Valid values are <code>0.10</code>