all: format code according to Go 1.19 rules

Go 1.19 started reformatting code in a way that makes it more obvious
how it will be rendered on pkg.go.dev. It gets it almost right, but not
entirely. Therefore, I had to modify some of the comments so that they
are formatted correctly.

src/internal/task/task_stack.go

@@ -89,6 +89,7 @@ func swapTask(oldStack uintptr, newStack *uintptr)
 // startTask is a small wrapper function that sets up the first (and only)
 // argument to the new goroutine and makes sure it is exited when the goroutine
 // finishes.
+//
 //go:extern tinygo_startTask
 var startTask [0]uint8