Fix typo

client/src/main/java/fr/insa/clavardator/client/users/PeerConnection.java

@@ -8,7 +8,7 @@ import org.jetbrains.annotations.Nullable;
 import java.io.Serializable;
 
 public abstract class PeerConnection {
-	public abstract void send(Serializable message, @Nullable SimpleCallback calback, @Nullable ErrorCallback errorCallback);
+	public abstract void send(Serializable message, @Nullable SimpleCallback callback, @Nullable ErrorCallback errorCallback);
 
 	/**
 	 * Subscribe to this user messages.