docs: add NOTICE to action bar icon pack and sprinkle download links

Change-Id: I1437ce64908c28621e86fff54767ddbd2b1fcb3a

Author: romannurik

docs/html/design/patterns/actionbar.html

@@ -133,7 +133,7 @@ <h2>General Organization</h2>
 you wish.
 Important: If the app is currently not displaying the top-level screen, be sure to display the Up
 caret to the left of the app icon, so the user can navigate up the hierarchy. For more discussion of
-Up navigation, see the "Navigation" pattern.
+Up navigation, see the <a href="../patterns/navigation.html">Navigation</a> pattern.
 
 <div class="figure">
   <img src="../static/content/action_bar_pattern_up_app_icon.png">
@@ -369,6 +369,22 @@ <h4>Action buttons</h4>
 <p>If either F, I, or T apply, then it's appropriate for the action bar. Otherwise, it belongs in the
 action overflow.</p>
 
+<p>
+
+Pre-defined glyphs should be used for certain common actions such as "refresh" and "share." The
+download link below provides a package with icons that are scaled for various screen densities and
+are suitable for use with the Holo Light and Holo Dark themes. The package also includes unstyled
+icons that you can modify to match your theme, in addition to Adobe&reg; Illustrator&reg; source
+files for further customization.
+
+</p>
+<p>
+
+<a href="../static/download/action_bar_icons-v4.0.zip">Download the Action Bar Icon
+Pack</a>
+
+</p>
+
 <div class="layout-content-row">
   <div class="layout-content-col span-6">
 

docs/html/design/static/download/action_bar_icons-v4.0.zip

@@ -193,10 +193,28 @@ <h4>Style</h4>
 
 <h2 id="actionbar">Action Bar</h2>
 
-<p>Action bar icons are graphic buttons that represent the most important actions people can take
+<p>
+
+Action bar icons are graphic buttons that represent the most important actions people can take
 within your app. Each one should employ a simple metaphor representing a single concept that most
-people can grasp at a glance.</p>
+people can grasp at a glance.
+
+</p>
+<p>
+
+Pre-defined glyphs should be used for certain common actions such as "refresh" and "share." The
+download link below provides a package with icons that are scaled for various screen densities and
+are suitable for use with the Holo Light and Holo Dark themes. The package also includes unstyled
+icons that you can modify to match your theme, in addition to Adobe&reg; Illustrator&reg; source
+files for further customization.
+
+</p>
+<p>
+
+<a href="../static/download/action_bar_icons-v4.0.zip">Download the Action Bar Icon
+Pack</a>
 
+</p>
 
 <div class="layout-content-row">
   <div class="layout-content-col span-4">