Added tooltips to sample randomizers

com.unity.perception/Runtime/Randomization/Randomizers/RandomizerExamples/Randomizers/BackgroundObjectPlacementRandomizer.cs

         /// <summary>
         /// The Z offset component applied to all generated background layers
         /// </summary>
+        [Tooltip("The Z offset applied to positions of all placed objects.")]
+        [Tooltip("The number of background layers to generate.")]
+        [Tooltip("The minimum distance between the centers of the placed objects.")]
+        [Tooltip("The width and height of the area in which objects will be placed. These should be positive numbers and sufficiently large in relation with the Separation Distance specified.")]
+        [Tooltip("The list of Prefabs to be placed by this Randomizer.")]
         public GameObjectParameter prefabs;
 
         GameObject m_Container;

com.unity.perception/Runtime/Randomization/Randomizers/RandomizerExamples/Randomizers/ColorRandomizer.cs

         static readonly int k_BaseColor = Shader.PropertyToID("_BaseColor");
 
         /// <summary>
-        /// Describes the range of random colors to assign to tagged objects
+        /// The range of random colors to assign to target objects
+        [Tooltip("The range of random colors to assign to target objects.")]
         public ColorHsvaParameter colorParameter;
 
         /// <summary>

com.unity.perception/Runtime/Randomization/Randomizers/RandomizerExamples/Randomizers/ForegroundObjectPlacementRandomizer.cs

         /// <summary>
         /// The Z offset component applied to the generated layer of GameObjects
         /// </summary>
+        [Tooltip("The Z offset applied to positions of all placed objects.")]
+        [Tooltip("The minimum distance between the centers of the placed objects.")]
+        [Tooltip("The width and height of the area in which objects will be placed. These should be positive numbers and sufficiently large in relation with the Separation Distance specified.")]
+        [Tooltip("The list of Prefabs to be placed by this Randomizer.")]
         public GameObjectParameter prefabs;
 
         GameObject m_Container;

com.unity.perception/Runtime/Randomization/Randomizers/RandomizerExamples/Randomizers/HueOffsetRandomizer.cs

         static readonly int k_HueOffsetShaderProperty = Shader.PropertyToID("_HueOffset");
 
         /// <summary>
-        /// The range of hue offsets to assign to tagged objects
+        /// The range of random hue offsets to assign to target objects
+        [Tooltip("The range of random hue offsets to assign to target objects.")]
         public FloatParameter hueOffset = new FloatParameter { value = new UniformSampler(-180f, 180f) };
 
         /// <summary>

com.unity.perception/Runtime/Randomization/Randomizers/RandomizerExamples/Randomizers/RotationRandomizer.cs

     public class RotationRandomizer : Randomizer
     {
         /// <summary>
-        /// Defines the range of random rotations that can be assigned to tagged objects
+        /// The range of random rotations to assign to target objects
+        [Tooltip("The range of random rotations to assign to target objects.")]
         public Vector3Parameter rotation = new Vector3Parameter
         {
             x = new UniformSampler(0, 360),

com.unity.perception/Runtime/Randomization/Randomizers/RandomizerExamples/Randomizers/SunAngleRandomizer.cs

     public class SunAngleRandomizer : Randomizer
     {
         /// <summary>
-        /// The hour of the day (0 to 24)
+        /// The range of hours in a day (default is 0 to 24)
+        [Tooltip("The range of hours in a day (default is 0 to 24).")]
-        /// The day of the year (0 being Jan 1st and 364 being December 31st)
+        /// The range of days in a year with 0 being Jan 1st and 364 being December 31st (default is 0 to 364)
-        public FloatParameter dayOfTheYear = new FloatParameter { value = new UniformSampler(0, 365)};
+        [Tooltip("The range of days in a year with 0 being Jan 1st and 364 being December 31st (default is 0 to 364).")]
+        public FloatParameter dayOfTheYear = new FloatParameter { value = new UniformSampler(0, 364)};
-        /// The earth's latitude (-90 is the south pole, 0 is the equator, and +90 is the north pole)
+        /// The range of latitudes. A latitude of -90 is the south pole, 0 is the equator, and +90 is the north pole (default is -90 to 90).
+        [Tooltip("The range of latitudes. A latitude of -90 is the south pole, 0 is the equator, and +90 is the north pole (default is -90 to 90).")]
         public FloatParameter latitude = new FloatParameter { value = new UniformSampler(-90, 90)};
 
         /// <summary>

com.unity.perception/Runtime/Randomization/Randomizers/RandomizerExamples/Randomizers/TextureRandomizer.cs

 #endif
 
         /// <summary>
-        /// The list of textures to sample and apply to tagged objects
+        /// The list of textures to sample and apply to target objects
+        [Tooltip("The list of textures to sample and apply to target objects.")]
         public Texture2DParameter texture;
 
         /// <summary>