Fixing a typo in the NumberPicker documentation.

Change-Id: I3a76923d468ddd01cd1ed5521992479cee82c6f0

Author: sganov

core/java/android/widget/NumberPicker.java

@@ -55,12 +55,12 @@
 
 /**
  * A widget that enables the user to select a number form a predefined range.
- * The widget presents an input filed and up and down buttons for selecting the
+ * The widget presents an input field and up and down buttons for selecting the
  * current value. Pressing/long pressing the up and down buttons increments and
- * decrements the current value respectively. Touching the input filed shows a
+ * decrements the current value respectively. Touching the input field shows a
  * scroll wheel, tapping on which while shown and not moving allows direct edit
  * of the current value. Sliding motions up or down hide the buttons and the
- * input filed, show the scroll wheel, and rotate the latter. Flinging is
+ * input field, show the scroll wheel, and rotate the latter. Flinging is
  * also supported. The widget enables mapping from positions to strings such
  * that instead the position index the corresponding string is displayed.
  * <p>