Fix small mistake in CharSequence.lastIndexOf documentation

libraries/stdlib/src/kotlin/text/Strings.kt

@@ -1013,7 +1013,7 @@ public fun CharSequence.indexOf(string: String, startIndex: Int = 0, ignoreCase:
  *
  * @param startIndex The index of character to start searching at. The search proceeds backward toward the beginning of the string.
  * @param ignoreCase `true` to ignore character case when matching a character. By default `false`.
- * @return An index of the first occurrence of [char] or -1 if none is found.
+ * @return An index of the last occurrence of [char] or -1 if none is found.
  */
 public fun CharSequence.lastIndexOf(char: Char, startIndex: Int = lastIndex, ignoreCase: Boolean = false): Int {
     return if (ignoreCase || this !is String)
@@ -1028,7 +1028,7 @@ public fun CharSequence.lastIndexOf(char: Char, startIndex: Int = lastIndex, ign
  *
  * @param startIndex The index of character to start searching at. The search proceeds backward toward the beginning of the string.
  * @param ignoreCase `true` to ignore character case when matching a string. By default `false`.
- * @return An index of the first occurrence of [string] or -1 if none is found.
+ * @return An index of the last occurrence of [string] or -1 if none is found.
  */
 public fun CharSequence.lastIndexOf(string: String, startIndex: Int = lastIndex, ignoreCase: Boolean = false): Int {
     return if (ignoreCase || this !is String)