netdiscover: add page (#13840)

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/common/netdiscover.md

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+# netdiscover
+
+> Network scanner used to find live hosts on a network.
+> More information: <https://github.com/netdiscover-scanner/netdiscover>.
+
+- Scan the IP range on the network interface for active hosts:
+
+`netdiscover -r {{172.16.6.0/23}} -i {{ens244}}`