Document ui.highlight theme key (#6372)

This scope was added via bf5b9a9
helix-editor · Mar 20, 2023 · 203cf1a · 203cf1a
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commit 203cf1a
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diff --git a/book/src/themes.md b/book/src/themes.md
@@ -306,6 +306,7 @@ These scopes are used for theming the editor interface:
 | `ui.menu.scroll`                  | `fg` sets thumb color, `bg` sets track color of scrollbar                                      |
 | `ui.selection`                    | For selections in the editing area                                                             |
 | `ui.selection.primary`            |                                                                                                |
+| `ui.highlight`                    | Highlighted lines in the picker preview                                                        |
 | `ui.cursorline.primary`           | The line of the primary cursor ([if cursorline is enabled][editor-section])                    |
 | `ui.cursorline.secondary`         | The lines of any other cursors ([if cursorline is enabled][editor-section])                    |
 | `ui.cursorcolumn.primary`         | The column of the primary cursor ([if cursorcolumn is enabled][editor-section])                |