Simplify the tooltip (#188)

Author: EvgeniiG

com.unity.render-pipelines.high-definition/Runtime/Lighting/AtmosphericScattering/Fog.cs

@@ -64,8 +64,7 @@ public class Fog : VolumeComponent
         [Tooltip("Controls the distribution of slices along the Camera's focal axis. 0 is exponential distribution and 1 is linear distribution.")]
         public ClampedFloatParameter sliceDistributionUniformity = new ClampedFloatParameter(0.75f, 0, 1);
         /// <summary>Resolution of the volumetric buffer (3D texture) along the X and Y axes relative to the resolution of the frame buffer.</summary>
-        [Tooltip("Resolution of the volumetric buffer (3D texture) along the X and Y axes relative to the resolution of the frame buffer. " +
-        "Setting it to 12.5% (1/8) means the number of voxels per slice is 1/8^2 = 1/64 = 1.5625% of the resolution of the frame buffer.")]
+        [Tooltip("Resolution of the volumetric buffer, along the x-axis and y-axis, relative to the resolution of the frame buffer.")]
         public ClampedFloatParameter screenResolutionPercentage = new ClampedFloatParameter((1.0f/8.0f) * 100, (1.0f/16.0f) * 100, 100);
         /// <summary>Number of slices of the volumetric buffer (3D texture) along the camera's focal axis.</summary>
         [Tooltip("Number of slices of the volumetric buffer (3D texture) along the camera's focal axis.")]