fix paths to example configs

doc/node/nodes/IEC61850-9-2.md

@@ -42,4 +42,4 @@ https://git.rwth-aachen.de/acs/public/villas/node/blob/master/lib/nodes/iec61850
 
 # Example {#node-type-uec61850-9-2-example}
 
-@include node/etc/examples/nodes/sampled_values.conf
+@include node/etc/examples/nodes/iec61850-9-2.conf

doc/node/nodes/SignalGenerator.md

@@ -86,4 +86,4 @@ If `true`, the @ref node-type-signal node-type will count missed steps and warn
 
 # Example {#node-type-signal-example}
 
-@include node/etc/examples/nodes/signal_generator.conf
+@include node/etc/examples/nodes/signal.conf

doc/node/nodes/Socket.md

@@ -84,14 +84,4 @@ The time to live for outgoing multicast packets.
 
 # Example {#node-type-socket-example}
 
-## UDP layer
-
-@include node/etc/examples/node/nodes/udp.conf
-
-## Ethernet layer
-
-@include node/etc/examples/nodes/ethernet.conf
-
-## Receive multicast traffic
-
-@include node/etc/examples/nodes/multicast.conf
+@include node/etc/examples/node/nodes/socket.conf