morphTargets and morphNormals property description updated

Description review for properties morphTargets and morphNormals for #17051

docs/api/en/materials/ShaderMaterial.html

@@ -378,13 +378,12 @@ this.extensions = {
 
 		<h3>[property:Boolean morphTargets]</h3>
 		<p>
-		Defines whether the material uses morphTargets; true morphTarget attributes to this shader
+		When set to true, morph target attributes are available in the vertex shader. Default is *false*.
 		</p>
 
 		<h3>[property:boolean morphNormals]</h3>
 		<p>
-			Defines whether the material uses morphNormals. Set as true to pass morphNormal attributes from the [page:Geometry]
-			to the shader. Default is *false*.
+		When set to true, morph normal attributes are available in the vertex shader. Default is *false*.
 		</p>