test: spec: rip_multihop: Add missing autogenerated file

test/case/routing/rip_multihop/test.adoc

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+=== RIP Multi-hop
+
+ifdef::topdoc[:imagesdir: {topdoc}../../test/case/routing/rip_multihop]
+
+==== Description
+
+Verifies RIP functionality across multiple hops with three routers in a line
+topology (R1 -- R2 -- R3). This test ensures:
+- RIP routes propagate through multiple hops
+- R2 (middle router) has two RIP neighbors
+- End-to-end connectivity works across the RIP network
+
+Topology:
+  PC:data1 -- R1 -- R2 -- R3 -- PC:data2
+
+==== Topology
+
+image::topology.svg[RIP Multi-hop topology, align=center, scaledwidth=75%]
+
+==== Sequence
+
+. Set up topology and attach to target DUTs
+. Configure routers
+. Wait for RIP routes to be exchanged
+. Verify R2 has two RIP neighbors
+. Test end-to-end connectivity PC:data1 to R3 loopback
+. Test end-to-end connectivity PC:data2 to R1 loopback
+
+