fix return type of pool (#37137)

Author: louisgab

src/Illuminate/Http/Client/Factory.php

@@ -35,7 +35,7 @@
  * @method \Illuminate\Http\Client\PendingRequest dump()
  * @method \Illuminate\Http\Client\PendingRequest dd()
  * @method \Illuminate\Http\Client\PendingRequest async()
- * @method \Illuminate\Http\Client\Pool pool(callable $callback)
+ * @method array pool(callable $callback)
  * @method \Illuminate\Http\Client\Response delete(string $url, array $data = [])
  * @method \Illuminate\Http\Client\Response get(string $url, array $query = [])
  * @method \Illuminate\Http\Client\Response head(string $url, array $query = [])

src/Illuminate/Support/Facades/Http.php

@@ -33,7 +33,7 @@
  * @method static \Illuminate\Http\Client\PendingRequest dump()
  * @method static \Illuminate\Http\Client\PendingRequest dd()
  * @method static \Illuminate\Http\Client\PendingRequest async()
- * @method static \Illuminate\Http\Client\Pool pool(callable $callback)
+ * @method static array pool(callable $callback)
  * @method static \Illuminate\Http\Client\Response delete(string $url, array $data = [])
  * @method static \Illuminate\Http\Client\Response get(string $url, array $query = [])
  * @method static \Illuminate\Http\Client\Response head(string $url, array $query = [])