[ci skip] Adapting the php comment on assert

Author: gxgpet

tests/codeigniter/libraries/Encryption_test.php

@@ -212,7 +212,7 @@ public function test_initialize_encrypt_decrypt()
 
 		$this->assertEquals($message, $this->encryption->decrypt($this->encryption->encrypt($message)));
 
-		// Try DES in ECB mode, just for the sake of changing stuff
+		// Try DES3 in OFB mode, just for the sake of changing stuff
 		$this->encryption->initialize(array('cipher' => 'tripledes', 'mode' => 'ofb', 'key' => substr($key, 0, 8)));
 		$this->assertEquals($message, $this->encryption->decrypt($this->encryption->encrypt($message)));
 	}