Add XMLDocs to difficulty attribute properties

osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyAttributes.cs

@@ -9,18 +9,39 @@ namespace osu.Game.Rulesets.Taiko.Difficulty
 {
     public class TaikoDifficultyAttributes : DifficultyAttributes
     {
+        /// <summary>
+        /// The difficulty corresponding to the stamina skill.
+        /// </summary>
         [JsonProperty("stamina_difficulty")]
         public double StaminaDifficulty { get; set; }
 
+        /// <summary>
+        /// The difficulty corresponding to the rhythm skill.
+        /// </summary>
         [JsonProperty("rhythm_difficulty")]
         public double RhythmDifficulty { get; set; }
 
+        /// <summary>
+        /// The difficulty corresponding to the colour skill.
+        /// </summary>
         [JsonProperty("colour_difficulty")]
         public double ColourDifficulty { get; set; }
 
+        /// <summary>
+        /// The perceived approach rate inclusive of rate-adjusting mods (DT/HT/etc).
+        /// </summary>
+        /// <remarks>
+        /// Rate-adjusting mods don't directly affect the approach rate difficulty value, but have a perceived effect as a result of adjusting audio timing.
+        /// </remarks>
         [JsonProperty("approach_rate")]
         public double ApproachRate { get; set; }
 
+        /// <summary>
+        /// The perceived hit window for a GREAT hit inclusive of rate-adjusting mods (DT/HT/etc).
+        /// </summary>
+        /// <remarks>
+        /// Rate-adjusting mods don't directly affect the hit window, but have a perceived effect as a result of adjusting audio timing.
+        /// </remarks>
         [JsonProperty("great_hit_window")]
         public double GreatHitWindow { get; set; }