Merge pull request #3980 from kenjis/patch-2

[ci skip] Fix sample code
diff --git a/user_guide_src/source/libraries/output.rst b/user_guide_src/source/libraries/output.rst
index 4b36d2a..84529f7 100644
--- a/user_guide_src/source/libraries/output.rst
+++ b/user_guide_src/source/libraries/output.rst
@@ -160,7 +160,7 @@
 
 		Permits you to manually set a server status header. Example::
 
-			$this->output->set_status_header('401');
+			$this->output->set_status_header(401);
 			// Sets the header as:  Unauthorized
 
 		`See here <http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html>`_ for a full list of headers.
@@ -230,4 +230,4 @@
 				->_display();
 			exit;
 
-		.. note:: Calling this method manually without aborting script execution will result in duplicated output.
\ No newline at end of file
+		.. note:: Calling this method manually without aborting script execution will result in duplicated output.