doc: update AWS guide to remove insmod rte_kni.ko step

rte_kni.ko was removed in F-Stack dev (commit b6692e6, Nov 2025).
KNI now uses virtio_user + vhost-net. Add a note explaining that
veth0 is created automatically by F-Stack on startup, and clarify
the comment above the kni interface configuration step.

Fixes: #755
See also: #893

Author: jfb8856606

doc/Launch_F-Stack_on_AWS_EC2_in_one_minute.md

@@ -30,6 +30,10 @@
     modprobe hwmon
     insmod build/kernel/linux/igb_uio/igb_uio.ko
 
+    # Note: rte_kni.ko is no longer needed (removed in F-Stack dev, Nov 2025).
+    # KNI now uses virtio_user + vhost-net (built into most kernels).
+    # The veth0 interface is created automatically by F-Stack on startup.
+
     # set ip address
     #redhat7.3
     export myaddr=`ifconfig eth0 | grep "inet" | grep -v ":" | awk -F ' '  '{print $2}'`
@@ -89,7 +93,8 @@
     # start Nginx
     /usr/local/nginx_fstack/sbin/nginx
 
-    # start kni
+    # configure kni interface (veth0 is created automatically by F-Stack on startup)
+    # wait for veth0 to appear before configuring it
     sleep 10
     ifconfig veth0 ${myaddr}  netmask ${mymask}  broadcast ${mybc} hw ether ${myhw}
     route add -net 0.0.0.0 gw ${mygw} dev veth0