Docs: Clean up. (#21845)

docs/api/en/materials/MeshPhysicalMaterial.html

@@ -82,14 +82,14 @@
 
 		<h3>[property:Float clearcoat]</h3>
 		<p>
-		Represents the thickness of the clear coat layer, from *0.0* to *1.0*. Use clear coat related properties to enable multilayer
+		Represents the intensity of the clear coat layer, from *0.0* to *1.0*. Use clear coat related properties to enable multilayer
 		materials that have a thin translucent layer over the base layer. Default is *0.0*.
 		</p>
 
 		<h3>[property:Texture clearcoatMap]</h3>
 		<p>
 		The red channel of this texture is multiplied against [page:.clearcoat], for per-pixel control
-		over a coating's thickness. Default is *null*.
+		over a coating's intensity. Default is *null*.
 		</p>
 
 		<h3>[property:Texture clearcoatNormalMap]</h3>

docs/api/zh/materials/MeshPhysicalMaterial.html

@@ -80,14 +80,14 @@
 
 		<h3>[property:Float clearcoat]</h3>
 		<p>
-		Represents the thickness of the clear coat layer, from *0.0* to *1.0*. Use clear coat related properties to enable multilayer
+		Represents the intensity of the clear coat layer, from *0.0* to *1.0*. Use clear coat related properties to enable multilayer
 		materials that have a thin translucent layer over the base layer. Default is *0.0*.
 		</p>
 
 		<h3>[property:Texture clearcoatMap]</h3>
 		<p>
 		The red channel of this texture is multiplied against [page:.clearcoat], for per-pixel control
-		over a coating's thickness. Default is *null*.
+		over a coating's intensity. Default is *null*.
 		</p>
 
 		<h3>[property:Texture clearcoatNormalMap]</h3>