docs: update references to NetworkConfiguration::extra_sets (#7386)

* docs: update references to NetworkConfiguration::extra_sets

Since paritytech/substrate#14080, this struct field no longer exists,
now the `add_notification_protocol()` function of
`sc_network::config::FullNetworkConfiguration` is used.

Also neuter the doc links for now; rustdoc can't resolve them
(presumably because sc_network::config isn't in scope, though weirdly
enough even spelling the link out as
``[`FullNetworkConfiguration`](struct@sc_network::config::FullNetworkConfiguration)``
doesn't work?). Normally this wouldn't be an issue and rustdoc would
just not generate links, but rust 1.70 has a bug that completely crashes
rustdoc in this case.

node/network/bridge/src/lib.rs

@@ -34,7 +34,7 @@ use polkadot_node_network_protocol::{
 
 /// Peer set info for network initialization.
 ///
-/// To be added to [`NetworkConfiguration::extra_sets`].
+/// To be passed to [`FullNetworkConfiguration::add_notification_protocol`]().
 pub use polkadot_node_network_protocol::peer_set::{peer_sets_info, IsAuthority};
 
 use std::{collections::HashMap, sync::Arc};

node/network/bridge/src/rx/mod.rs

@@ -49,7 +49,7 @@ use polkadot_primitives::{AuthorityDiscoveryId, BlockNumber, Hash, ValidatorInde
 
 /// Peer set info for network initialization.
 ///
-/// To be added to [`NetworkConfiguration::extra_sets`].
+/// To be passed to [`FullNetworkConfiguration::add_notification_protocol`]().
 pub use polkadot_node_network_protocol::peer_set::{peer_sets_info, IsAuthority};
 
 use std::{

node/network/bridge/src/tx/mod.rs

@@ -31,7 +31,7 @@ use polkadot_node_subsystem::{
 
 /// Peer set info for network initialization.
 ///
-/// To be added to [`NetworkConfiguration::extra_sets`].
+/// To be passed to [`FullNetworkConfiguration::add_notification_protocol`]().
 pub use polkadot_node_network_protocol::peer_set::{peer_sets_info, IsAuthority};
 use sc_network::ReputationChange;