Fix docblocks for throw_if and throw_unless. (#48003)

* Fix docblocks for throw_if and throw_unless.

* Re-order docblock types.

Author: AbdelElrafa

src/Illuminate/Support/helpers.php

@@ -317,7 +317,7 @@ function tap($value, $callback = null)
      * @template TException of \Throwable
      *
      * @param  mixed  $condition
-     * @param  TException|class-string<TException>  $exception
+     * @param  TException|class-string<TException>|string  $exception
      * @param  mixed  ...$parameters
      * @return mixed
      *
@@ -344,7 +344,7 @@ function throw_if($condition, $exception = 'RuntimeException', ...$parameters)
      * @template TException of \Throwable
      *
      * @param  mixed  $condition
-     * @param  TException|class-string<TException>  $exception
+     * @param  TException|class-string<TException>|string  $exception
      * @param  mixed  ...$parameters
      * @return mixed
      *