docs: Document BindConstraint and AlignConstraint

Add the missing gtk-doc annotations for BindConstraint and
AlignConstraint, plus the licensing blurb.

clutter/clutter-align-constraint.h

@@ -1,3 +1,27 @@
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * Copyright (C) 2010  Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author:
+ *   Emmanuele Bassi <ebassi@linux.intel.com>
+ */
+
 #if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
 #error "Only <clutter/clutter.h> can be included directly."
 #endif
@@ -13,8 +37,26 @@ G_BEGIN_DECLS
 #define CLUTTER_ALIGN_CONSTRAINT(obj)           (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_ALIGN_CONSTRAINT, ClutterAlignConstraint))
 #define CLUTTER_IS_ALIGN_CONSTRAINT(obj)        (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_ALIGN_CONSTRAINT))
 
+/**
+ * ClutterAlignConstraint:
+ *
+ * <structname>ClutterAlignConstraint</structname> is an opaque structure
+ * whose members cannot be directly accesses
+ *
+ * Since: 1.4
+ */
 typedef struct _ClutterAlignConstraint  ClutterAlignConstraint;
 
+/**
+ * ClutterAlignAxis:
+ * @CLUTTER_ALIGN_X_AXIS: Maintain the alignment on the X axis
+ * @CLUTTER_ALIGN_Y_AXIS: Maintain the alignment on the Y axis
+ *
+ * Specifies the axis on which #ClutterAlignConstraint should maintain
+ * the alignment
+ *
+ * Since: 1.4
+ */
 typedef enum { /*< prefix=CLUTTER_ALIGN >*/
   CLUTTER_ALIGN_X_AXIS,
   CLUTTER_ALIGN_Y_AXIS,