fix: apply whitespace fixes (#753)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

Documentation/Concepts/Backend/GeneralBackendStructure/PageTree/Index.rst

@@ -138,7 +138,7 @@ page related functions. Here is what these options do:
   - **More options ... > Import**: Opens the import tool and preselects the selected
     page
 
-- **Enable** or **Disable**: Enables or disables the page depending on its current state. 
+- **Enable** or **Disable**: Enables or disables the page depending on its current state.
   Disabled pages can be edited as normal, but are not accessible from the frontend.
 
 - **Delete**: Deletes the page