Fix documentation warnings

gobject-introspection now emits many more warnings for malformed
comments, and they fail the build.

https://bugzilla.gnome.org/show_bug.cgi?id=673656

src/st/st-types.h

@@ -14,6 +14,18 @@
  * You should have received a copy of the GNU Lesser General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
+#ifndef __ST_TYPES_H__
+#define __ST_TYPES_H__
+
+#if !defined(ST_H_INSIDE) && !defined(ST_COMPILATION)
+#error "Only <st/st.h> can be included directly.h"
+#endif
+
+#include <glib-object.h>
+#include <clutter/clutter.h>
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
 
 /**
  * SECTION:st-types
@@ -22,20 +34,6 @@
  * Common types for StWidgets.
  */
 
-
-#if !defined(ST_H_INSIDE) && !defined(ST_COMPILATION)
-#error "Only <st/st.h> can be included directly.h"
-#endif
-
-#ifndef __ST_TYPES_H__
-#define __ST_TYPES_H__
-
-#include <glib-object.h>
-#include <clutter/clutter.h>
-#include <gtk/gtk.h>
-
-G_BEGIN_DECLS
-
 typedef enum {
   ST_ALIGN_START,
   ST_ALIGN_MIDDLE,