Improve documentation on Vibrator.vibrate.

Bug: 3135537
Change-Id: I961e32990d754dc6b5f86ffea8515685f8ade40f
diff --git a/core/java/android/os/Vibrator.java b/core/java/android/os/Vibrator.java
index e9428f7..3769cfe 100644
--- a/core/java/android/os/Vibrator.java
+++ b/core/java/android/os/Vibrator.java
@@ -22,6 +22,7 @@
  * Class that operates the vibrator on the device.
  * <p>
  * If your process exits, any vibration you started with will stop.
+ * </p>
  */
 public class Vibrator
 {
@@ -56,7 +57,7 @@
     /**
      * Turn the vibrator on.
      *
-     * @param milliseconds How long to vibrate for.
+     * @param milliseconds The number of milliseconds to vibrate.
      */
     public void vibrate(long milliseconds)
     {
@@ -75,12 +76,17 @@
      * Vibrate with a given pattern.
      *
      * <p>
-     * Pass in an array of ints that are the times at which to turn on or off
-     * the vibrator.  The first one is how long to wait before turning it on,
-     * and then after that it alternates.  If you want to repeat, pass the
-     * index into the pattern at which to start the repeat.
+     * Pass in an array of ints that are the durations for which to turn on or off
+     * the vibrator in milliseconds.  The first value indicates the number of milliseconds
+     * to wait before turning the vibrator on.  The next value indicates the number of milliseconds
+     * for which to keep the vibrator on before turning it off.  Subsequent values alternate
+     * between durations in milliseconds to turn the vibrator off or to turn the vibrator on.
+     * </p><p>
+     * To cause the pattern to repeat, pass the index into the pattern array at which
+     * to start the repeat, or -1 to disable repeating.
+     * </p>
      *
-     * @param pattern an array of longs of times to turn the vibrator on or off.
+     * @param pattern an array of longs of times for which to turn the vibrator on or off.
      * @param repeat the index into pattern at which to repeat, or -1 if
      *        you don't want to repeat.
      */