ExifInterface: Update javadoc for saveAttributes

Bug: 31319086
Test: Checked the created javadoc with "make docs"
Change-Id: I97c77ba4f00a95bc5eedf1dcee942aebd2d89ccb

media/java/android/media/ExifInterface.java

@@ -1551,6 +1551,11 @@ public class ExifInterface {
      * copying all the data from one file to another and deleting the old file and renaming the
      * other. It's best to use {@link #setAttribute(String,String)} to set all attributes to write
      * and make a single call rather than multiple calls for each attribute.
+     * <p>
+     * This method is only supported for JPEG files.
+     * </p>
+     *
+     * @throws UnsupportedOperationException If this method is called with unsupported files.
      */
     public void saveAttributes() throws IOException {
         if (mIsRaw) {