Fix some PHPDoc @return type.

lib/Doctrine/ORM/Query/Expr.php

@@ -75,7 +75,7 @@ class Expr
      * Creates an ASCending order expression.
      *
      * @param $sort
-     * @return OrderBy
+     * @return Expr\OrderBy
      */
     public function asc($expr)
     {
@@ -86,7 +86,7 @@ class Expr
      * Creates a DESCending order expression.
      *
      * @param $sort
-     * @return OrderBy
+     * @return Expr\OrderBy
      */
     public function desc($expr)
     {

lib/Doctrine/ORM/QueryBuilder.php

@@ -119,7 +119,7 @@ class QueryBuilder
      * For more complex expression construction, consider storing the expression
      * builder object in a local variable.
      *
-     * @return Expr
+     * @return Query\Expr
      */
     public function expr()
     {