[libgee] Fix the documentation to use constant

[Maciej Marcin Piechotka <mpiechotka src gnome org>]

commit f9ae8bbb98706c851518fc7f8335a57048a6da54
Author: Maciej Piechotka <uzytkownik2 gmail com>
Date:   Mon Nov 18 00:22:43 2013 +0100

    Fix the documentation to use constant

 gee/queue.vala |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gee/queue.vala b/gee/queue.vala
index 3658e67..90f3cc0 100644
--- a/gee/queue.vala
+++ b/gee/queue.vala
@@ -52,12 +52,12 @@ public interface Gee.Queue<G> : Collection<G> {
        public static const int UNBOUNDED_CAPACITY = -1;
 
        /**
-        * The capacity of this queue (or ``null`` if capacity is not bound).
+        * The capacity of this queue (or ``UNBOUNDED_CAPACITY`` if capacity is not bound).
         */
        public abstract int capacity { get; }
 
        /**
-        * The remaining capacity of this queue (or ``null`` if capacity is not
+        * The remaining capacity of this queue (or ``UNBOUNDED_CAPACITY`` if capacity is not
         * bound).
         */
        public abstract int remaining_capacity { get; }