Remove empty <returns> xmldoc

osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs

@@ -574,7 +574,6 @@ namespace osu.Game.Rulesets.Objects.Drawables
         /// Calculate the position to be used for sample playback at a specified X position (0..1).
         /// </summary>
         /// <param name="position">The lookup X position. Generally should be <see cref="SamplePlaybackPosition"/>.</param>
-        /// <returns></returns>
         protected double CalculateSamplePlaybackBalance(double position)
         {
             const float balance_adjust_amount = 0.4f;

osu.Game/Rulesets/Objects/SliderPath.cs

@@ -147,7 +147,6 @@ namespace osu.Game.Rulesets.Objects
         /// to 1 (end of the path).
         /// </summary>
         /// <param name="progress">Ranges from 0 (beginning of the path) to 1 (end of the path).</param>
-        /// <returns></returns>
         public Vector2 PositionAt(double progress)
         {
             ensureValid();
@@ -161,7 +160,6 @@ namespace osu.Game.Rulesets.Objects
         /// The first point has a PathType which all other points inherit.
         /// </summary>
         /// <param name="controlPoint">One of the control points in the segment.</param>
-        /// <returns></returns>
         public List<PathControlPoint> PointsInSegment(PathControlPoint controlPoint)
         {
             bool found = false;

osu.Game/Rulesets/Ruleset.cs

@@ -146,7 +146,6 @@ namespace osu.Game.Rulesets
         /// <param name="beatmap">The beatmap to create the hit renderer for.</param>
         /// <param name="mods">The <see cref="Mod"/>s to apply.</param>
         /// <exception cref="BeatmapInvalidForRulesetException">Unable to successfully load the beatmap to be usable with this ruleset.</exception>
-        /// <returns></returns>
         public abstract DrawableRuleset CreateDrawableRulesetWith(IBeatmap beatmap, IReadOnlyList<Mod> mods = null);
 
         /// <summary>

osu.Game/Rulesets/Scoring/HitWindows.cs

@@ -62,7 +62,6 @@ namespace osu.Game.Rulesets.Scoring
         /// <summary>
         /// Retrieves a mapping of <see cref="HitResult"/>s to their timing windows for all allowed <see cref="HitResult"/>s.
         /// </summary>
-        /// <returns></returns>
         public IEnumerable<(HitResult result, double length)> GetAllAvailableWindows()
         {
             for (var result = HitResult.Meh; result <= HitResult.Perfect; ++result)