routel: add page (#18389)

Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>

pages/linux/routel.md

@@ -0,0 +1,21 @@
+# routel
+
+> List IP routing in a human readable format.
+> See also: `ip route`, `route`.
+> More information: <https://manned.org/man/routel>.
+
+- Display the default routing table:
+
+`routel`
+
+- Display a specific routing table:
+
+`routel {{table_number|main|local|default}}`
+
+- Display only IPv4 routes:
+
+`routel {{[-4|--family inet]}}`
+
+- Display only IPv6 routes:
+
+`routel {{[-6|--family inet6]}}`