docs: horizontal plot split

src/ui_dock.cpp

@@ -104,7 +104,7 @@ void clear_box(GtkWidget* box) {
 
 /// The strip's cell widths, in characters. Fixed like the dock's, so the strip's chips are as wide with
 /// `--` as with `-123.456 mV` (what does not fit scrolls).
-constexpr int kStripWhoChars = 6;
+constexpr int kStripWhoChars = 7;
 constexpr int kStripTypeChars = 10;
 
 /// A flat text button that opens a slide-over page. It only opens a page, so a rebuild can never free the