[doc] kvmfr: Update udev rule example

Starting with version 258, "systemd-udevd ignores OWNER=/GROUP=
settings with a non-system user/group specified in udev rules files".
Change the example udev rule to remove the explicit user assignment and
instead use the "uaccess" tag to auto-assign the logged-in user
permissions. As "uaccess" tags are processed using the 73-seat-late
udev rule, the KVMFR rule file name must precede it (i.e. should use
a lower ordinal value), so change the file name in the example to reflect that.
Credit goes to Discord user "w1kl4s" for bringing this systemd change
to our attention and assisting in testing.

doc/ivshmem_kvmfr.rst

@@ -120,12 +120,17 @@ change its ownership manually, i.e.:
 
    sudo chown user:kvm /dev/kvmfr0
 
-As an example, you can create a new file in ``/etc/udev/rules.d/99-kvmfr.rules``
+(replace ``user`` with your username)
+
+As an example, you can create a new file in ``/etc/udev/rules.d/70-kvmfr.rules``
 with the following contents::
 
-   SUBSYSTEM=="kvmfr", OWNER="user", GROUP="kvm", MODE="0660"
+   SUBSYSTEM=="kvmfr", GROUP="kvm", MODE="0660", TAG+="uaccess"
 
-(replace ``user`` with your username)
+.. note::
+
+   Make sure the udev rule file name ordinal value is below (lexically sorts before) ``73-seat-late.rules``
+   to allow the uaccess tag to be processed properly.
 
 .. _ivshmem_kvmfr_libvirt:
 

doc/words.txt

@@ -33,6 +33,7 @@ imgui
 ini
 kvmfr
 laggy
+lexically
 libdecor
 libpipewire
 libpulse
@@ -75,6 +76,7 @@ Threadripper
 toolchain
 tritanope
 tunable
+uaccess
 udev
 UEFI
 uncheck