Update some docs

Author: duncte123

src/main/kotlin/dev/arbjerg/lavalink/client/LavalinkNode.kt

@@ -31,6 +31,9 @@ import java.net.URI
 import java.util.function.Consumer
 import java.util.function.UnaryOperator
 
+/**
+ * The Node is a physical instance of the lavalink server software.
+ */
 class LavalinkNode(
     val name: String,
     serverUri: URI,

src/main/kotlin/dev/arbjerg/lavalink/client/LavalinkPlayer.kt

@@ -8,6 +8,9 @@ import dev.arbjerg.lavalink.protocol.v4.PlayerState
 import dev.arbjerg.lavalink.protocol.v4.VoiceState
 import kotlin.math.min
 
+/**
+ * Represents a player that is tied to a guild.
+ */
 class LavalinkPlayer(private val node: LavalinkNode, protocolPlayer: Player) : IUpdatablePlayer {
     val guildId = protocolPlayer.guildId.toLong()