Add all missing docs

PkmnLib.Dynamic/Models/BattleSide.cs

@@ -142,9 +142,19 @@ public interface IBattleSide : IScriptSource, IDeepCloneable
     /// </summary>
     IItem? GetLastConsumedItem(byte battleDataPosition);
 
+    /// <summary>
+    /// Marks a Pokémon as fainted. This is used to track the last turn a Pokémon in a position fainted.
+    /// </summary>
     void MarkFaint(byte position);
 
+    /// <summary>
+    /// Gets the last turn a Pokémon in a specific position fainted.
+    /// </summary>
     uint? GetLastFaintTurn(byte position);
+
+    /// <summary>
+    /// Gets the last turn a Pokémon in any position fainted.
+    /// </summary>
     uint? GetLastFaintTurn();
 }