Make examples runnable

* Also drop args from fun main

Author: AlexanderPrendota

core/kotlinx-coroutines-core/test/guide/example-basic-01.kt

@@ -7,7 +7,7 @@ package kotlinx.coroutines.guide.basic01
 
 import kotlinx.coroutines.*
 
-fun main(args: Array<String>) {
+fun main() {
     GlobalScope.launch { // launch new coroutine in background and continue
         delay(1000L) // non-blocking delay for 1 second (default time unit is ms)
         println("World!") // print after delay

core/kotlinx-coroutines-core/test/guide/example-basic-02.kt

@@ -7,7 +7,7 @@ package kotlinx.coroutines.guide.basic02
 
 import kotlinx.coroutines.*
 
-fun main(args: Array<String>) { 
+fun main() { 
     GlobalScope.launch { // launch new coroutine in background and continue
         delay(1000L)
         println("World!")

core/kotlinx-coroutines-core/test/guide/example-basic-02b.kt

@@ -7,7 +7,7 @@ package kotlinx.coroutines.guide.basic02b
 
 import kotlinx.coroutines.*
 
-fun main(args: Array<String>) = runBlocking<Unit> { // start main coroutine
+fun main() = runBlocking<Unit> { // start main coroutine
     GlobalScope.launch { // launch new coroutine in background and continue
         delay(1000L)
         println("World!")

core/kotlinx-coroutines-core/test/guide/example-basic-03.kt

@@ -7,11 +7,13 @@ package kotlinx.coroutines.guide.basic03
 
 import kotlinx.coroutines.*
 
-fun main(args: Array<String>) = runBlocking {
+fun main() = runBlocking {
+//sampleStart
     val job = GlobalScope.launch { // launch new coroutine and keep a reference to its Job
         delay(1000L)
         println("World!")
     }
     println("Hello,")
     job.join() // wait until child coroutine completes
+//sampleEnd    
 }

core/kotlinx-coroutines-core/test/guide/example-basic-03s.kt

@@ -7,7 +7,7 @@ package kotlinx.coroutines.guide.basic03s
 
 import kotlinx.coroutines.*
 
-fun main(args: Array<String>) = runBlocking { // this: CoroutineScope
+fun main() = runBlocking { // this: CoroutineScope
     launch { // launch new coroutine in the scope of runBlocking
         delay(1000L)
         println("World!")

core/kotlinx-coroutines-core/test/guide/example-basic-04.kt

@@ -7,7 +7,7 @@ package kotlinx.coroutines.guide.basic04
 
 import kotlinx.coroutines.*
 
-fun main(args: Array<String>) = runBlocking { // this: CoroutineScope
+fun main() = runBlocking { // this: CoroutineScope
     launch { 
         delay(200L)
         println("Task from runBlocking")

core/kotlinx-coroutines-core/test/guide/example-basic-05.kt

@@ -7,7 +7,7 @@ package kotlinx.coroutines.guide.basic05
 
 import kotlinx.coroutines.*
 
-fun main(args: Array<String>) = runBlocking {
+fun main() = runBlocking {
     launch { doWorld() }
     println("Hello,")
 }

core/kotlinx-coroutines-core/test/guide/example-basic-06.kt

@@ -7,7 +7,7 @@ package kotlinx.coroutines.guide.basic06
 
 import kotlinx.coroutines.*
 
-fun main(args: Array<String>) = runBlocking {
+fun main() = runBlocking {
     repeat(100_000) { // launch a lot of coroutines
         launch {
             delay(1000L)

core/kotlinx-coroutines-core/test/guide/example-basic-07.kt

@@ -7,12 +7,14 @@ package kotlinx.coroutines.guide.basic07
 
 import kotlinx.coroutines.*
 
-fun main(args: Array<String>) = runBlocking {
+fun main() = runBlocking {
+//sampleStart
     GlobalScope.launch {
         repeat(1000) { i ->
             println("I'm sleeping $i ...")
             delay(500L)
         }
     }
     delay(1300L) // just quit after delay
+//sampleEnd    
 }

core/kotlinx-coroutines-core/test/guide/example-cancel-01.kt

@@ -7,7 +7,8 @@ package kotlinx.coroutines.guide.cancel01
 
 import kotlinx.coroutines.*
 
-fun main(args: Array<String>) = runBlocking {
+fun main() = runBlocking {
+//sampleStart
     val job = launch {
         repeat(1000) { i ->
             println("I'm sleeping $i ...")
@@ -19,4 +20,5 @@ fun main(args: Array<String>) = runBlocking {
     job.cancel() // cancels the job
     job.join() // waits for job's completion 
     println("main: Now I can quit.")
+//sampleEnd    
 }