camera3: Update optical stabilization tags.

Change-Id: Ic2bdec216c1685f2ea3036f9d027ea24679a8bfe
diff --git a/core/java/android/hardware/camera2/CaptureResult.java b/core/java/android/hardware/camera2/CaptureResult.java
index 9237267..7303502 100644
--- a/core/java/android/hardware/camera2/CaptureResult.java
+++ b/core/java/android/hardware/camera2/CaptureResult.java
@@ -1133,9 +1133,14 @@
             new Key<float[]>("android.lens.focusRange", float[].class);
 
     /**
-     * <p>Whether optical image stabilization is
-     * enabled.</p>
-     * <p>Will not be supported on most devices.</p>
+     * <p>Sets whether the camera device uses optical image stabilization (OIS)
+     * when capturing images.</p>
+     * <p>OIS is used to compensate for motion blur due to small movements of
+     * the camera during capture. Unlike digital image stabilization, OIS makes
+     * use of mechanical elements to stabilize the camera sensor, and thus
+     * allows for longer exposure times before camera shake becomes
+     * apparent.</p>
+     * <p>This is not expected to be supported on most devices.</p>
      * @see #LENS_OPTICAL_STABILIZATION_MODE_OFF
      * @see #LENS_OPTICAL_STABILIZATION_MODE_ON
      */