capslock: Use proper registry key on Windows 10

Unfortunately, the registry key for custom layouts in the
HKEY_CURRENT_USER hierarchy has been disabled in Windows 7 and up (see
[1]). Microsoft only documents the HKEY_LOCAL_MACHINE variant which
affects all users (see [2]):

> - The mappings stored in the registry work at system level and apply
>   to all users. These mappings cannot be set to work differently
>   depending on the current user.

Unfortunately, this change also affects all users. There is no
per-user option on Windows, unless you use additional applications
such as Microsoft's own PowerToys [3], AutoHotkey or similar software.

 [1]: https://answers.microsoft.com/en-us/windows/forum/windows_7-desktop/remap-keyboard-with-scancode-map-for-current-user/34abda0d-721a-4e27-b9a4-044f34dc113a#?page=1
 [2]: https://docs.microsoft.com/de-de/windows-hardware/drivers/hid/keyboard-and-mouse-class-drivers#scan-code-mapper-for-keyboards
 [3]: https://github.com/microsoft/PowerToys

README.org

@@ -94,12 +94,12 @@ On Windows you can use a simple registry file to tweak the CapsLock mapping.  Sa
 #+begin_src
 
 REGEDIT4
-[HKEY_CURRENT_USER\Keyboard Layout]
+[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
 "Scancode Map"=hex:00,00,00,00,00,00,00,00,02,00,00,00,1d,00,3a,00,00,00,00,00
 
 #+end_src
 
-Now double-click on this file in Windows Explorer and allow Windows to apply it to your registry settings.  After you log out of your current session and log back in the new key mapping should be in effect.
+Now double-click on this file in Windows Explorer and allow Windows to apply it to your registry settings.  After you log out of your current session and log back in the new key mapping should be in effect. Note that this change will affect *all* users on your system.
 
 *macOS*