tools: format most examples and tutorials, add them to v test-cleancode (#9826)

examples/x64/hello_world.v

@@ -1,21 +1,20 @@
-//fn println(s string) { }
+// fn println(s string) { }
 
-//fn test_fn() {
-	//println('test fn')
+// fn test_fn() {
+// println('test fn')
 //}
 
 fn main() {
 	println('x64 test')
-	//i := 0
-	//for i < 5 {
-	for _ in 1..5 {
+	// i := 0
+	// for i < 5 {
+	for _ in 1 .. 5 {
 		println('Hello world from V x64 machine code generator!')
-		//i++
+		// i++
 	}
-		/*
+	/*
 	println('Hello again!')
 	//test_fn()
 	println('done')
 	*/
 }
-