add newlines at the end of files (mostly for pipeline retrigger)

Author: fada21

src/androidTest/java/androidx/core/widget/AdapterViewTest.kt

@@ -214,4 +214,4 @@ class AdapterViewTest {
             }
         }
     }
-}
+}

src/main/java/androidx/core/widget/AdapterView.kt

@@ -42,7 +42,7 @@ inline fun <T> AdapterView<*>.onItemLongClick(crossinline onItemLongClick: (item
 }
 
 /**
- * Simple use case (default empty `onNothingSelected` set):
+ * Simple use case (empty `onNothingSelected` default provided):
  * ```kotlin
  *     spinner.onItemSelected { parent, _, position, _ ->
  *         val item = parent.getItemAtPosition(position)
@@ -82,7 +82,7 @@ inline fun AdapterView<*>.onItemSelected(
  * Sets selection listener with automatic item casting
  * (ClassCastException will be thrown if adapter's item type does not match)
  *
- * Simple use case (default empty `onNothingSelected` set):
+ * Simple use case (empty `onNothingSelected` default provided):
  * ```kotlin
  *     spinner.onItemSelected { item: T -> ??? }
  * ```
@@ -110,4 +110,4 @@ inline fun <T> AdapterView<*>.onItemSelected(
             onItemSelected(parent.getItemAtPosition(position) as T)
         }
     }
-}
+}