Fixed issue if comment contains quotes. It sould duplicate the quotes in MySQL platform.

lib/Doctrine/DBAL/Platforms/MySqlPlatform.php

@@ -368,7 +368,9 @@ class MySqlPlatform extends AbstractPlatform
         $query .= 'TABLE ' . $tableName . ' (' . $queryFields . ') ';
 
         if (isset($options['comment'])) {
-            $query .= sprintf("COMMENT = '%s' ", $options['comment']);
+            $comment = trim($options['comment'], " '");
+
+            $query .= sprintf("COMMENT = '%s' ", str_replace("'", "''", $comment));
         }
 
         if ( ! isset($options['charset'])) {