Add samples for last() and lastOrNull() functions

libraries/stdlib/common/src/generated/_Strings.kt

@@ -139,7 +139,10 @@ public inline fun CharSequence.indexOfLast(predicate: (Char) -> Boolean): Int {
 
 /**
  * Returns the last character.
- * @throws [NoSuchElementException] if the char sequence is empty.
+ * 
+ * @throws NoSuchElementException if the char sequence is empty.
+ * 
+ * @sample samples.text.Strings.last
  */
 public fun CharSequence.last(): Char {
     if (isEmpty())
@@ -149,7 +152,10 @@ public fun CharSequence.last(): Char {
 
 /**
  * Returns the last character matching the given [predicate].
- * @throws [NoSuchElementException] if no such character is found.
+ * 
+ * @throws NoSuchElementException if no such character is found.
+ * 
+ * @sample samples.text.Strings.last
  */
 public inline fun CharSequence.last(predicate: (Char) -> Boolean): Char {
     for (index in this.indices.reversed()) {
@@ -161,6 +167,8 @@ public inline fun CharSequence.last(predicate: (Char) -> Boolean): Char {
 
 /**
  * Returns the last character, or `null` if the char sequence is empty.
+ * 
+ * @sample samples.text.Strings.last
  */
 public fun CharSequence.lastOrNull(): Char? {
     return if (isEmpty()) null else this[length - 1]
@@ -168,6 +176,8 @@ public fun CharSequence.lastOrNull(): Char? {
 
 /**
  * Returns the last character matching the given [predicate], or `null` if no such character was found.
+ * 
+ * @sample samples.text.Strings.last
  */
 public inline fun CharSequence.lastOrNull(predicate: (Char) -> Boolean): Char? {
     for (index in this.indices.reversed()) {