fixed bug in attaching nics to hosts, changed documentation format and generator (buggy but usable)

docs/network/network_node.md

@@ -1,6 +1,7 @@
 # network/network_node.h
-
-## class NetworkNode — public interface
-
-### `explicit NetworkNode(Simulator *const sim, NodeId id, NodeType type) noexcept;`
-### `virtual ~NetworkNode() = default;`
+## `NetworkNode::NetworkNode`
+`explicit NetworkNode(Simulator *const sim, NodeId id, NodeType type) noexcept`
+## `NetworkNode::recv_pkt`
+`virtual void recv_pkt(Packet &pkt, PortId ingress) = 0`
+## `NetworkNode::~NetworkNode`
+`virtual ~NetworkNode() = default`