clarify mode switch behavior

Author: ranbel

src/content/docs/cloudflare-one/connections/connect-devices/warp/deployment/mdm-deployment/windows-multiuser.mdx

@@ -87,7 +87,7 @@ To use multi-user mode alongside the [Windows pre-login](/cloudflare-one/connect
 </dict>
 ```
 
-Switching to multi-user mode will require a user to re-register even if they had a previous registration.
+When enabling multi-user mode for the first time, users will need to re-register even if they had a previous registration.
 
 ## WARP registration logic