Updated docs.

overview.html

@@ -598,7 +598,6 @@ preprocessor define.</p>
 <div class="section" id="todo">
 <h2>Todo<a class="headerlink" href="#todo" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
-<li>Blit between textures.</li>
 <li>Occlusion queries.</li>
 <li>Fullscreen mode.</li>
 <li>ETC2, PVRTC1/2 decoding fallback for targets that don&#8217;t support it
@@ -608,7 +607,6 @@ natively.</li>
 <li>Multiple vertex streams support.</li>
 <li>Animated mesh example.</li>
 <li>Vulkan renderer backend.</li>
-<li>Texture readback.</li>
 </ul>
 </div>
 <div class="section" id="getting-involved">