Merge pull request appium#136 from alewang/alewang/touch-action-doc

Update documentation for moveTo

Author: Jonahss

src/main/java/io/appium/java_client/TouchAction.java

@@ -105,9 +105,11 @@ public TouchAction moveTo(WebElement el) {
  }
 
  /**
- * Move current touch to an absolute position on the screen
- * @param x x coordinate
- * @param y y coordinate
+ * Move current touch to a new position relative to the current position on
+ * the screen. If the current position of this TouchAction is (xOld, yOld),
+ * then this method will move the TouchAction to (xOld + x, yOld + y).
+ * @param x change in x coordinate to move through
+ * @param y change in y coordinate to move through
  * @return this TouchAction, for chaining
  */
  public TouchAction moveTo(int x, int y) {