docs: Removed Q preview language and added a link to the Android 10 page on developer.android.com.

Test: http://go/forrest-run/L62500000661914456
Bug: 149267624
Change-Id: I73b92cf0af8f78117448db9a89d7685f45bc512d

core/java/android/os/Build.java

@@ -1006,10 +1006,16 @@ public class Build {
 
         /**
          * Q.
-         * <p>
-         * <em>Why? Why, to give you a taste of your future, a preview of things
-         * to come. Con permiso, Capitan. The hall is rented, the orchestra
-         * engaged. It's now time to see if you can dance.</em>
+         *
+         * <p>Applications targeting this or a later release will get these new changes in behavior.
+         * For more information about this release, see the
+         * <a href="/about/versions/10">Android 10 overview</a>.</p>
+         * <ul>
+         * <li><a href="/about/versions/10/behavior-changes-all">Behavior changes: all apps</a></li>
+         * <li><a href="/about/versions/10/behavior-changes-10">Behavior changes: apps targeting API
+         * 29+</a></li>
+         * </ul>
+         *
          */
         public static final int Q = 29;