Use different bracket types to show cursor position

runtime/help/copy_selection_on_next_line.txt

@@ -6,13 +6,13 @@ Copies the current primary selection to the next line long enough to accomodate
 
 The selection is copied from line 1 to line 2.
 ┌───────────────────────────┐     ┌───────────────────────────┐
-│ This is text [on line 1]. │ --> │ This is text [on line 1]. │
+│ This is text (on line 1]. │ --> │ This is text (on line 1]. │
-│ This is text on line 2.   │     │ This is text [on line 2]. │
+│ This is text on line 2.   │     │ This is text (on line 2]. │
 └───────────────────────────┘     └───────────────────────────┘
 
 The selection duplication skips line 2 because it is too short.
 ┌──────────────────────────────────┐     ┌──────────────────────────────────┐
-│ This is a longer li[ne of t]ext. │     │ This is a longer li[ne of t]ext. │
+│ This is a longer li(ne of t]ext. │     │ This is a longer li(ne of t]ext. │
 │ This is a shorter line.          │ --> │ This is a shorter line.          │
-│ This is another longer line.     │     │ This is another lon[ger lin]e.   │
+│ This is another longer line.     │     │ This is another lon(ger lin]e.   │
 └──────────────────────────────────┘     └──────────────────────────────────┘

runtime/help/copy_selection_on_prev_line.txt

@@ -6,13 +6,13 @@ Copies the current primary selection to the first previous line long enough to a
 
 The selection is copied from line 2 to line 1.
 ┌───────────────────────────┐     ┌───────────────────────────┐
-│ This is text on line 1.   │ --> │ This is text [on line 1]. │
+│ This is text on line 1.   │ --> │ This is text (on line 1]. │
-│ This is text [on line 2]. │     │ This is text [on line 2]. │
+│ This is text (on line 2]. │     │ This is text (on line 2]. │
 └───────────────────────────┘     └───────────────────────────┘
 
 The selection duplication skips line 2 because it is too short.
 ┌──────────────────────────────────┐     ┌──────────────────────────────────┐
-│ This is a longer line of text.   │     │ This is a longer li[ne of t]ext. │
+│ This is a longer line of text.   │     │ This is a longer li(ne of t]ext. │
 │ This is a shorter line.          │ --> │ This is a shorter line.          │
-│ This is another lon[ger lin]e.   │     │ This is another lon[ger lin]e.   │
+│ This is another lon(ger lin]e.   │     │ This is another lon(ger lin]e.   │
 └──────────────────────────────────┘     └──────────────────────────────────┘