reverted API removal

Author: michalChrobot

com.unity.netcode.gameobjects/Runtime/NetworkVariable/AnticipatedNetworkVariable.cs

@@ -249,8 +249,16 @@ public T AuthoritativeValue
                 }
             }
         }
-        
 
+        /// <summary>
+        /// A function to interpolate between two values based on a percentage.
+        /// See <see cref="Mathf.Lerp"/>, <see cref="Vector3.Lerp"/>, <see cref="Vector3.Slerp"/>, and so on
+        /// for examples.
+        /// </summary>
+        /// <param name="authoritativeValue">The authoritative value to interpolate from</param>
+        /// <param name="anticipatedValue">The anticipated value to interpolate to</param>
+        /// <param name="amount">The interpolation factor between 0 and 1</param>
+        /// <returns>The interpolated value</returns>
         public delegate T SmoothDelegate(T authoritativeValue, T anticipatedValue, float amount);
 
         private SmoothDelegate m_SmoothDelegate = null;