Update doctrine.rts

Query example in documentation has a missing `;`

Author: LeorentKelmendi

doctrine.rst

@@ -780,7 +780,7 @@ based on PHP conditions)::
             ->orderBy('p.price', 'ASC');
 
         if (!$includeUnavailableProducts) {
-            $qb->andWhere('p.available = TRUE')
+            $qb->andWhere('p.available = TRUE');
         }
 
         $query = $qb->getQuery();