FP4: Update user action wording

Make the wording more generic since the installer supports also
postmarketOS. Also update the support URLs, especially the first one
doesn't work anymore.

v2/devices/FP4.yml

@@ -9,12 +9,12 @@ user_actions:
     description: "Please check that your device is a Fairphone 4 (FP4)."
   confirm_os:
     title: "Confirm OS version"
-    description: "Your device must be running the Fairphone OS version of Android 11 before installing Ubuntu Touch. With a previously installed custom ROM, it won't work!"
-    link: "https://support.fairphone.com/hc/en-us/articles/4405858261777"
+    description: "Your device must be running the Fairphone OS version of Android 11 before installing another operating system. With a previously installed custom ROM, it won't work!"
+    link: "https://support.fairphone.com/hc/en-us/articles/18896094650513-Installing-Fairphone-OS-Manually"
   unlock_phone:
     title: "Unlock the bootloader"
-    description: "Before installing Ubuntu Touch you must unlock the bootloader of your phone manually. Follow the steps in the linked page if you haven't already."
-    link: "https://support.fairphone.com/hc/en-us/articles/10492476238865"
+    description: "Before installing another operating system you must unlock the bootloader of your phone manually. Follow the steps in the linked page if you haven't already."
+    link: "https://support.fairphone.com/hc/en-us/articles/10492476238865-Manage-the-Bootloader"
   bootloader:
     title: "Reboot to Bootloader"
     description: "With the device powered off, press and hold the VOLUME DOWN button and plug the device into your PC via USB. After some seconds you'll see the fastboot mode."