Document all undocumented methods and properties

Plugins/PkmnLib.Plugin.Gen7/Scripts/Status/Sleep.cs

@@ -8,7 +8,6 @@ namespace PkmnLib.Plugin.Gen7.Scripts.Status;
 public class Sleep : Script
 {
     public int Turns { get; set; }
-    private IPokemon? _owner;
 
     /// <inheritdoc />
     public override void OnAddedToParent(IScriptSource source)
@@ -18,7 +17,6 @@ public class Sleep : Script
             return;
         if (source is not IPokemon pokemon)
             throw new InvalidOperationException("Sleep script can only be added to a Pokemon.");
-        _owner = pokemon;
         var battleData = pokemon.BattleData;
         if (battleData != null)
         {