chore(spellchecker): fix typos in comment

- use spellchecker, and check false positive manually

```
codespell  -L crate,COMIT,comit  -S CHANGELOG.md
```
- maybe we can add typo checker in github action ref: https://github.com/codespell-project/actions-codespell

Pull-Request: #5750.

protocols/kad/src/behaviour/test.rs

@@ -1381,7 +1381,7 @@ fn network_behaviour_on_address_change() {
         port_use: PortUse::Reuse,
     };
 
-    // Mimick a connection being established.
+    // Mimic a connection being established.
     kademlia.on_swarm_event(FromSwarm::ConnectionEstablished(ConnectionEstablished {
         peer_id: remote_peer_id,
         connection_id,
@@ -1403,7 +1403,7 @@ fn network_behaviour_on_address_change() {
         .unwrap()
         .is_empty());
 
-    // Mimick the connection handler confirming the protocol for
+    // Mimic the connection handler confirming the protocol for
     // the test connection, so that the peer is added to the routing table.
     kademlia.on_connection_handler_event(
         remote_peer_id,