improve docs

Author: leoparente

docs/backends/network_discovery.md

@@ -85,3 +85,10 @@ orb:
           max_retries: 0
 
 ```
+### ⚠️ Warning
+Be **AWARE** that executing a policy with only targets defined is equivalent to running `nmap <targets>`, which in turn is the same as executing `nmap -sS -p1-1000 --open -T3 <target>`:
+
+- `-sS` → SYN scan (stealth scan, requires root privileges)
+- `-p1-1000` → Scans the top 1000 most common ports
+- `--open` → Only shows open ports
+- `-T3` → Uses the default timing template (T3 is the standard speed)