Fix typo in doc/gty.texi

gcc/ChangeLog:
	* doc/gty.texi (Support for inheritance): Fix missing
	parentheses in example.

From-SVN: r230609

gcc/ChangeLog

+2015-11-19  David Malcolm  <dmalcolm@redhat.com>
+
+	* doc/gty.texi (Support for inheritance): Fix missing
+	parentheses in example.
+
 2015-11-19  Marek Polacek  <polacek@redhat.com>
 
 	PR tree-optimization/68431

gcc/doc/gty.texi

@@ -429,13 +429,13 @@ public:
     tree a;
 @};
 
-class GTY((tag("1")) some_subclass : public example_base
+class GTY((tag("1"))) some_subclass : public example_base
 @{
 public:
     tree b;
 @};
 
-class GTY((tag("2")) some_other_subclass : public example_base
+class GTY((tag("2"))) some_other_subclass : public example_base
 @{
 public:
     tree c;