Add small documentation for HDProbe public fields

com.unity.render-pipelines.high-definition/HDRP/Lighting/Reflection/HDProbe.cs

 
         [SerializeField, FormerlySerializedAsAttribute("dimmer"), FormerlySerializedAsAttribute("m_Dimmer"), FormerlySerializedAsAttribute("multiplier")]
         float m_Multiplier = 1.0f;
-
         [SerializeField, FormerlySerializedAsAttribute("weight")]
         [Range(0.0f, 1.0f)]
         float m_Weight = 1.0f;
         [SerializeField]
         ReflectionProbeRefreshMode m_RefreshMode = ReflectionProbeRefreshMode.OnAwake;
 
+        /// <summary>ProxyVolume currently used by this probe.</summary>
+
+        /// <summary>Multiplier factor of reflection (non PBR parameter).</summary>
+
+        /// <summary>Weight for blending amongst probes (non PBR parameter).</summary>
+
+        /// <summary>The capture mode.</summary>
+
+        /// <summary>Refreshing rate of the capture for Realtime capture mode.</summary>
         public virtual ReflectionProbeRefreshMode refreshMode
         {
             get { return m_RefreshMode; }