ui: the s shortcut says dock, not side panel

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

src/shortcuts.cpp

@@ -18,7 +18,7 @@ constexpr Accel kAccels[] = {
     {GDK_KEY_g, 0, AppAction::ShowSignals, "g", "Go to Signals", "Panes and editors"},
     {GDK_KEY_l, 0, AppAction::LayoutEditor, "l", "Show or hide the layout editor",
      "Panes and editors"},
-    {GDK_KEY_s, 0, AppAction::SidePanel, "s", "Show or hide the side panel",
+    {GDK_KEY_s, 0, AppAction::SidePanel, "s", "Show or hide the dock",
      "Panes and editors"},
     {GDK_KEY_e, GDK_CONTROL_MASK, AppAction::Export, "<Control>e",
      "Export the visible range", "Files and windows"},