Rename launch to async

Thus we've come full circle :P

src/Future.php

@@ -91,7 +91,7 @@ final class Future
     /**
      * @param FutureState<T> $state
      *
-     * @internal Use {@see Deferred} or {@see launch()} to create and resolve a Future.
+     * @internal Use {@see Deferred} or {@see async()} to create and resolve a Future.
      */
     public function __construct(FutureState $state)
     {

src/functions.php

@@ -16,7 +16,7 @@ use Revolt\EventLoop\UnsupportedFeatureException;
  *
  * @return Future<T>
  */
-function launch(\Closure $closure): Future
+function async(\Closure $closure): Future
 {
     static $run = null;
 

test/Future/FutureTest.php

@@ -11,8 +11,8 @@ use Amp\PHPUnit\LoopCaughtException;
 use Amp\PHPUnit\TestException;
 use Amp\TimeoutCancellationToken;
 use Revolt\EventLoop;
+use function Amp\async;
 use function Amp\delay;
-use function Amp\launch;
 
 class FutureTest extends AsyncTestCase
 {
@@ -319,13 +319,13 @@ class FutureTest extends AsyncTestCase
      * @template T
      *
      * @param float $seconds
-     * @param T     $value
+     * @param T $value
      *
      * @return Future<T>
      */
     private function delay(float $seconds, mixed $value): Future
     {
-        return launch(
+        return async(
         /**
          * @return T
          */