Update documentation on theme settings general availability release with new picker and dark dimmed mode (#18390)

Author: mattpollard

assets/images/help/settings/theme-choose-a-day-and-night-theme-to-sync.png

@@ -1,25 +1,24 @@
 ---
 title: Managing your theme settings
-intro: 'You can manage how {% data variables.product.product_name %} looks to you by setting a theme preference that either follows your system settings or always uses light mode or dark mode.'
+intro: 'You can manage how {% data variables.product.product_name %} looks to you by setting a theme preference that either follows your system settings or always uses a light or dark mode.'
 versions:
   free-pro-team: '*'
 topics:
   - accounts
 ---
 
-{% note %}
-
-**Note:** Theme settings is currently in beta and subject to change.
-
-{% endnote %}
-
-For choice and flexibility in how and when you use {% data variables.product.product_name %}, you can configure theme settings to change how {% data variables.product.product_name %} looks to you. You can choose from two themes, light and dark, or you can configure {% data variables.product.product_name %} to follow your system settings. Some developers use dark theme for personal preference, to reduce power consumption on certain devices, or to reduce eye strain in low-light conditions.
+For choice and flexibility in how and when you use {% data variables.product.product_name %}, you can configure theme settings to change how {% data variables.product.product_name %} looks to you. You can choose from themes that are light or dark, or you can configure {% data variables.product.product_name %} to follow your system settings. You may want to use a dark theme to reduce power consumption on certain devices, to reduce eye strain in low-light conditions, or because you prefer how the theme looks.
 
 {% data reusables.user_settings.access_settings %}
 1. In the user settings sidebar, click **Appearance**.
     !["Appearance" tab in user settings sidebar](/assets/images/help/settings/appearance-tab.png)
-1. Under "Theme", select a theme preference.
-    ![Radio buttons for theme settings](/assets/images/help/settings/theme-settings-radio-buttons.png)
+1. Under "Theme mode", select the drop-down menu, then click a theme preference.
+    ![Drop-down menu under "Theme mode" for selection of theme preference](/assets/images/help/settings/theme-mode-drop-down-menu.png)
+1. Click the theme you'd like to use.
+    - If you chose a single theme, click a theme.
+      ![Radio buttons for the choice of a single theme](/assets/images/help/settings/theme-choose-a-single-theme.png)
+    - If you chose to follow your system settings, click a day theme and a night theme.
+      ![Buttons for the choice of a theme to sync with the system setting](/assets/images/help/settings/theme-choose-a-day-and-night-theme-to-sync.png)
 
 ### Further reading