Merge pull request #17554 from aardgoose/doc-info

document the existence of info.renderer.frame

docs/api/en/renderers/WebGLRenderer.html

@@ -188,6 +188,7 @@
 					<li>triangles</li>
 					<li>points</li>
 					<li>lines</li>
+					<li>frame</li>
 				</ul>
 			</li>
 			<li>programs

docs/api/zh/renderers/WebGLRenderer.html

@@ -167,6 +167,7 @@
 					<li>triangles</li>
 					<li>points</li>
 					<li>lines</li>
+					<li>frame</li>
 				</ul>
 			</li>
 			<li>programs