docs: the readouts dock, the cursors and measurement pages

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

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

@@ -25,8 +25,9 @@
         <p>Press the cursors button in the toolbar, or <key>c</key>.</p>
       </item>
       <item>
-        <p>The pane below the plot shows the readings and owns a <gui>Reset</gui> button.
-        Drag a marker to move it.</p>
+        <p>The readings are in the side panel (a read-only copy) and in the cursors panel, which
+        <gui>Edit</gui> beside <gui>Cursors</gui> opens over the plot and which owns a
+        <gui>Reset</gui> button. Drag a marker to move it.</p>
       </item>
       <item>
         <p>The mode dropdown offers four modes: <gui>vertical</gui> (the shared time pair),

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

@@ -28,10 +28,10 @@
     <title>How to reach it</title>
     <steps>
       <item>
-        <p>Press the measurements button in the toolbar, or <key>m</key>.</p>
+        <p>Press <key>m</key>, or <gui>Edit</gui> beside <gui>Measurements</gui> in the side panel.</p>
       </item>
       <item>
-        <p>The pane's <gui>+</gui> adds one; clicking a row opens the dialog where the signal,
+        <p>The panel's <gui>+</gui> adds one; clicking a row opens the dialog where the signal,
         the type, the threshold share or shares and the on-plot marks are set, with
         <gui>Save</gui> and <gui>Delete</gui>.</p>
       </item>

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

@@ -88,11 +88,13 @@
       </item>
       <item>
         <title>The side panel</title>
-        <p>Two tabs. <gui>Measure</gui> holds the cursors readout and the measurements
-        derived from it; <gui>Signals</gui> holds the trigger and the channel list, where a
-        math channel is a row of that one list under a <gui>MATH</gui> heading whose
-        <gui>+</gui> creates one. One row per channel: its colour, an enable switch, its name
-        and its unit. A channel's badge in the badge bar is dragged onto a plot row.</p>
+        <p>A read-only copy of the cursors and of the measurements; the <gui>Edit</gui> button
+        beside each heading opens that instrument's full panel over the plot. The channel
+        list and the trigger are panels of their own, opened from the badge bar and the
+        toolbar, where a math channel is a row of the one list under a <gui>MATH</gui>
+        heading whose <gui>+</gui> creates one. One row per channel: its colour, an enable
+        switch, its name and its unit. A channel's badge in the badge bar is dragged onto a
+        plot row.</p>
       </item>
       <item>
         <title>The plot</title>