docs: the readouts strip

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

help/C/org.udpscope.app/overview.page

@@ -116,7 +116,8 @@
         shows and hides. Its <gui>Readouts</gui> are a read-only copy of the cursors and of
         every measurement; <gui>Edit</gui> beside each heading opens that instrument's full
         page. Under them, <gui>Events</gui> lists the captured events, newest first; a click
-        replays one and <gui>Manage</gui> opens the full list.</p>
+        replays one and <gui>Manage</gui> opens the full list. While the dock is hidden, the
+        readouts show in a strip under the plot instead.</p>
       </item>
       <item>
         <title>The status bar</title>