fmt: replace go with spawn

examples/concurrency/concurrency.v

@@ -9,9 +9,9 @@ fn expensive_computing(id int, duration int) {
 
 fn main() {
 	mut threads := []thread{}
-	threads << go expensive_computing(1, 100)
-	threads << go expensive_computing(2, 500)
-	threads << go expensive_computing(3, 1000)
+	threads << spawn expensive_computing(1, 100)
+	threads << spawn expensive_computing(2, 500)
+	threads << spawn expensive_computing(3, 1000)
 	// Join all tasks
 	threads.wait()
 	println('All jobs finished!')

examples/concurrency/concurrency_http.v

@@ -26,7 +26,7 @@ fn main() {
 	mut wg := sync.new_waitgroup()
 	wg.add(2)
 	// Run tasks async
-	go vlang_time(mut wg)
-	go remote_ip(mut wg)
+	spawn vlang_time(mut wg)
+	spawn remote_ip(mut wg)
 	wg.wait()
 }

examples/concurrency/concurrency_returns.v

@@ -5,7 +5,7 @@ fn expensive_computing(i int) int {
 fn main() {
 	mut threads := []thread int{}
 	for i in 1 .. 10 {
-		threads << go expensive_computing(i)
+		threads << spawn expensive_computing(i)
 	}
 	// Join all tasks
 	r := threads.wait()