Remove stale remark

Author: keveleigh

Assets/MRTK/Core/Attributes/MixedRealityExtensionServiceAttribute.cs

@@ -105,9 +105,6 @@ public MixedRealityExtensionServiceAttribute(
         /// <summary>
         /// Convenience function for retrieving the attribute given a certain class type.
         /// </summary>
-        /// <remarks>
-        /// This function is only available in a UnityEditor context.
-        /// </remarks>
         public static MixedRealityExtensionServiceAttribute Find(Type type)
         {
             return type.GetCustomAttributes(typeof(MixedRealityExtensionServiceAttribute), true).FirstOrDefault() as MixedRealityExtensionServiceAttribute;