kotlin.system docs improvements

- Rewrite exitProcess docs in a more common way
- Add [block] parameter reference

libraries/stdlib/jvm/src/kotlin/system/Process.kt

@@ -7,11 +7,12 @@
 package kotlin.system
 
 /**
- * Terminates the currently running Java Virtual Machine. The
+ * Terminates the currently running process.
- * argument serves as a status code; by convention, a nonzero status
- * code indicates abnormal termination.
  *
- * This method never returns normally.
+ * @param status serves as a status code; by convention,
+ * a nonzero status code indicates abnormal termination.
+ *
+ * @return This method never returns normally.
  */
 @kotlin.internal.InlineOnly
 public inline fun exitProcess(status: Int): Nothing {

libraries/stdlib/jvm/src/kotlin/system/Timing.kt

@@ -7,7 +7,7 @@
 package kotlin.system
 
 /**
- * Executes the given block and returns elapsed time in milliseconds.
+ * Executes the given [block] and returns elapsed time in milliseconds.
  */
 public inline fun measureTimeMillis(block: () -> Unit): Long {
     val start = System.currentTimeMillis()
@@ -16,7 +16,7 @@ public inline fun measureTimeMillis(block: () -> Unit): Long {
 }
 
 /**
- * Executes the given block and returns elapsed time in nanoseconds.
+ * Executes the given [block] and returns elapsed time in nanoseconds.
  */
 public inline fun measureNanoTime(block: () -> Unit): Long {
     val start = System.nanoTime()