Drop the "read-only" qualifier

osu.Framework/Bindables/ILeasedBindable.cs

···
 namespace osu.Framework.Bindables
 {
     /// <summary>
-    /// An interface that represents a read-only leased bindable.
+    /// An interface that represents a leased bindable.
     /// </summary>
     public interface ILeasedBindable : IBindable
     {
···
     }
 
     /// <summary>
-    /// An interface that representes a read-only leased bindable.
+    /// An interface that representes a leased bindable.
     /// </summary>
     /// <typeparam name="T">The value type of the bindable.</typeparam>
     public interface ILeasedBindable<T> : ILeasedBindable, IBindable<T>