docs: add color comments to Custom Accent Color example

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: paddymul

docs/source/articles/theme-customization.rst

@@ -230,8 +230,8 @@ look.
 .. code-block:: python
 
     component_config = {'theme': {
-        'accentColor': '#ff6600',
-        'accentHoverColor': '#cc5200',
+        'accentColor': '#ff6600',      # orange — click a column to see it
+        'accentHoverColor': '#cc5200', # darker orange on hover
     }}
 
 .. raw:: html