docs: Updated support library revision history for 23.4.0

See first comment for doc stage location. Support library 23.4.0
is already live, so I'll post the doc update as soon as we get it
approved.

bug: 28276098
Change-Id: I76816392661c1f57d4a0cb8ab44c08f8ab4225f4

docs/html/tools/support-library/index.jd

@@ -185,6 +185,135 @@ page.title=Support Library
 <p>This section provides details about the Support Library package releases.</p>
 
 <div class="toggle-content opened">
+  <p id="rev23-4-0">
+    <a href="#" onclick="return toggleContent(this)"><img src=
+    "{@docRoot}assets/images/styles/disclosure_up.png" class=
+    "toggle-content-img" alt="">Android Support Library, revision 23.4.0</a>
+    <em>(May 2016)</em>
+  </p>
+
+  <div class="toggle-content-toggleme">
+    <dl>
+      <dt>
+        Changes for <a href=
+        "{@docRoot}tools/support-library/features.html#v4">v4 Support
+        Library</a>:
+      </dt>
+
+      <dd>
+        <ul>
+          <li>Fixed issue where fragments were added in the wrong order.
+          (<a class="external-link" href=
+          "https://code.google.com/p/android/issues/detail?id=206901">Issue
+          206901</a>)
+          </li>
+
+          <li>Fixed issue where app bar wasn't drawn after being scrolled
+          offscreen. (<a class="external-link" href=
+          "https://code.google.com/p/android/issues/detail?id=178037">Issue
+          178037</a>)
+          </li>
+        </ul>
+      </dd>
+
+      <dt>
+        Changes for <a href=
+        "{@docRoot}tools/support-library/features.html#v7-appcompat">v7
+        appcompat library</a>:
+      </dt>
+
+      <dd>
+        <ul>
+          <li>Added <!-- TODO: Link to method -->
+             <code><a href=
+            "{@docRoot}reference/android/support/v7/app/AppCompatDelegate.html">
+            AppCompatDelegate</a>.setCompatVectorFromResourcesEnabled()</code>
+            method to re-enable usage of vector drawables in {@link
+            android.graphics.drawable.DrawableContainer} objects on devices
+            running Android 4.4 (API level 19) and lower. See <a href=
+            "https://medium.com/@chrisbanes/appcompat-v23-2-age-of-the-vectors-91cbafa87c88#.44uulkfal"
+            class="external-link">AppCompat v23.2 — Age of the vectors</a> for
+            more information.
+          </li>
+
+          <li>Fixed an issue in API 23 with <a href=
+          "{@docRoot}reference/android/support/v7/app/AppCompatDelegate.html#setDefaultNightMode(int)">
+            <code>AppCompatDelegate.setDefaultNightMode()</code></a> not
+            loading correct resources in API level 23. (<a class=
+            "external-link" href=
+            "https://code.google.com/p/android/issues/detail?id=206573">Issue
+            206573</a>)
+          </li>
+
+          <li>Fixed issue that could cause {@link
+          java.lang.NullPointerException}. (<a class="external-link" href=
+          "https://code.google.com/p/android/issues/detail?id=207638">Issue
+          207638</a>)
+          </li>
+        </ul>
+      </dd>
+
+      <dt>
+        Changes for <a href=
+        "{@docRoot}tools/support-library/features.html#design">Design Support
+        Library</a>:
+      </dt>
+
+      <dd>
+        <ul>
+          <li>Fixed an issue where {@link
+          android.support.design.widget.TextInputLayout} doesn't clear error
+          tint after {@link
+          android.support.design.widget.TextInputLayout#setErrorEnabled
+          setErrorEnabled(false)} on API level 21 - 22 (<a class=
+          "external-link" href=
+          "https://code.google.com/p/android/issues/detail?id=202829">Issue
+          202829</a>)
+          </li>
+
+          <li>Fixed an issue where {@link
+          android.support.design.widget.FloatingActionButton} does not return
+          when animations are disabled. (<a class="external-link" href=
+          "https://code.google.com/p/android/issues/detail?id=206416">Issue
+          206416</a>)
+          </li>
+
+          <li>Fixed issue in {@link android.support.design.widget.AppBarLayout}
+          snap functionality when used with <code>{@link
+                    android.support.design.R.id#scroll}|{@link
+                    android.support.design.R.id#enterAlways}|{@link
+                    android.support.design.R.id#enterAlwaysCollapsed}|{@link
+                    android.support.design.R.id#snap}</code> scroll flags.
+          (<a class="external-link" href=
+          "https://code.google.com/p/android/issues/detail?id=207398">Issue
+          207398</a>)
+          </li>
+        </ul>
+      </dd>
+
+      <dt>
+        Changes for <!-- TODO: Add link -->Vector Drawable library:
+      </dt>
+
+      <dd>
+        <ul>
+          <li>Fixed a bug where <!-- TODO: Javadoc link -->
+             <code>VectorDrawableCompat</code> does not render correctly in
+            {@link android.widget.TextView} on API level 23. (<a class=
+            "external-link" href=
+            "https://code.google.com/p/android/issues/detail?id=206227">Issue
+            206227</a>)
+          </li>
+        </ul>
+      </dd>
+    </dl>
+  </div>
+</div>
+
+<!-- end of collapsible section: 23.4.0 -->
+
+
+<div class="toggle-content closed">
   <p id="rev23-3-0">
     <a href="#" onclick="return toggleContent(this)"><img src=
     "{@docRoot}assets/images/styles/disclosure_up.png" class="toggle-content-img"