Updated MeshPhongMaterial.html to include displacement properties

Updated MeshPhongMaterial.html docs to include displacement properties (displacementMap, displacementScale, displacementBias) in r73.

docs/api/materials/MeshPhongMaterial.html

@@ -29,6 +29,9 @@
 		aoMap — Set ao map. Default is null.<br />
 		specularMap — Set specular map. Default is null.<br />
 		alphaMap — Set alpha map. Default is null.<br />
+		displacementMap — Set displacement map. Default is null.<br />
+		displacementScale — Set displacement scale. Default is 1.<br />
+		displacementBias — Set displacement offset. Default is 0.<br />
 		envMap — Set env map. Default is null.<br />
 		fog — Define whether the material color is affected by global fog settings. Default is true.<br />
 		shading — Define shading type. Default is THREE.SmoothShading.<br />
@@ -114,6 +117,22 @@
 		<div>The alpha map is a grayscale texture that controls the opacity across the surface (black: fully transparent; white: fully opaque). Default is null.</div>
 		<div>Only the color of the texture is used, ignoring the alpha channel if one exists. For RGB and RGBA textures, the [page:WebGLRenderer WebGL] renderer will use the green channel when sampling this texture due to the extra bit of precision provided for green in DXT-compressed and uncompressed RGB 565 formats. Luminance-only and luminance/alpha textures will also still work as expected.</div>
 
+		<h3>[property:Texture displacementMap]</h3>
+		<div>
+			The displacement map affects the position of the mesh's vertices. Unlike other maps which only affect the light and shade of the material the displaced vertices can cast shadows, block other objects, and otherwise act as real geometry. 
+			The displacement texture is an image where the value of each pixel (white being the highest) is mapped against, and repositions, the vertices of the mesh.
+		</div>
+		
+		<h3>[property:Float displacementScale]</h3>
+		<div>
+			How much the displacement map affects the mesh (where black is no displacement, and white is maximum displacement). Without a displacement map set, this value is not applied. Default is 1.
+		</div>
+		
+		<h3>[property:Float displacementBias]</h3>
+		<div>
+			The offset of the displacement map's values on the mesh's vertices. Without a displacement map set, this value is not applied. Default is 0.
+		</div>
+		
 		<h3>[property:TextureCube envMap]</h3>
 		<div>Set env map. Default is null.</div>