doc/log-forward: update notifications

doc/log-forward.d/notification-01-info.avif
----- >8 -----
[rsc] 📝️ Log Forwarding

The log on rsc contains these 2 messages after 00:01:19 uptime.

ℹ️ 2025-11-20 16:40:25 system;info router rebooted by ssh:eworm@10.10.0.37
ℹ️ 2025-11-20 16:40:27 script;info global-functions: Loaded on hAP ax^2 with RouterOS 7.20.4 (stable).
----- >8 -----

doc/log-forward.d/notification-02-warn.avif
----- >8 -----
[rsc] 📝️⚠️ Log Forwarding

The log on rsc contains these 3 messages after 01:23:19 uptime.

🟠️ 2025-11-20 17:35:48 dhcp;warning dhcp offering lease 192.168.2.254 for 02:00:BA:DC:AB:1E without success
🔴️ 2025-11-20 17:35:57 dhcp;error pool6 refused acquire: bad preferred prefix! (1)
ℹ️ 2025-11-20 17:36:25 system;info;account user eworm logged in from 10.10.0.37 via ssh
----- >8 -----

doc/log-forward.md

@@ -35,9 +35,11 @@ The script works around the limitations, for example it does:
 It is intended to be run periodically from scheduler, then collects new
 log messages and forwards them via notification.
 
-### Sample notification
+### Sample notifications
 
-![log-forward notification](log-forward.d/notification.avif)
+![log-forward notification info](log-forward.d/notification-01-info.avif)
+
+![log-forward notification warn](log-forward.d/notification-02-warn.avif)
 
 Requirements and installation
 -----------------------------