Fix link to materials skin example

docs/api/materials/ShaderMaterial.html

@@ -95,7 +95,7 @@
 			[example:webgl_materials_lightmap webgl / materials / lightmap]<br />
 			[example:webgl_materials_parallaxmap webgl / materials / parallaxmap]<br />
 			[example:webgl_materials_shaders_fresnel webgl / materials / shaders / fresnel]<br />
-			[example:webgl_materials_skin webgl_materials / skin]<br />
+			[example:webgl_materials_skin webgl / materials / skin]<br />
 			[example:webgl_materials_texture_hdr webgl / materials / texture / hdr]<br />
 			[example:webgl_materials_wireframe webgl / materials / wireframe]<br />
 			[example:webgl_modifier_tessellation webgl / modifier / tessellation]<br />