Revise heading for dual pane split direction

Updated section heading for clarity on dual pane split direction.

Author: yaira2

src/routes/docs/customize-settings/general/+page.md

@@ -50,7 +50,7 @@ The Files Home page offers customizable widgets to provide quick access to impor
 
 If you frequently compare or transfer files between locations, enabling this setting can save time by automatically opening new tabs in [dual pane](/docs/features/dual-pane) mode.
 
-### Default dual pane split direction arrangement
+### Default dual pane split direction
 
 Tabs can be set to open with a **horizontal** or **vertical** split.
 
@@ -60,4 +60,4 @@ The context menu is where many quick actions live. You can choose to hide defaul
 
 ## Move shell extensions into sub menu
 
-To enhance performance, shell extensions are placed in a submenu by default. However, you can disable this option if you'd prefer to see all items directly in the main context menu.
+To enhance performance, shell extensions are placed in a submenu by default. However, you can disable this option if you'd prefer to see all items directly in the main context menu.