Add Network Topology plugin docs (#4981)

Author: mdbirnstiehl

docs/en/observability/images/network-topology-device-flyout.png

@@ -163,6 +163,13 @@ include::profiling-self-managed.asciidoc[leveloffset=+3]
 include::profiling-self-managed-ops.asciidoc[leveloffset=+4]
 include::profiling-self-managed-troubleshooting.asciidoc[leveloffset=+4]
 
+// Network Topology
+include::network-topology.asciidoc[leveloffset=+2]
+
+include::network-topology-get-started.asciidoc[leveloffset=+3]
+
+include::network-topology-fields.asciidoc[leveloffset=+3]
+
 // Tutorials
 include::monitor-k8s/monitor-k8s.asciidoc[leveloffset=+2]