[gupnp] Fix typos in API documentation

[Bastien Nocera <hadess src gnome org>]

commit 4440a1332af3dd377791777b40cfb8113e82d6b0
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Dec 3 17:58:00 2015 +0100

    Fix typos in API documentation
    
    In this context "its" is an article, not a subject followed by a verb,
    so "its", not "it's". Bob the Angry Flower fixed them all.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=759000

 libgupnp/gupnp-context-manager.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libgupnp/gupnp-context-manager.c b/libgupnp/gupnp-context-manager.c
index 7c58f31..76915d9 100644
--- a/libgupnp/gupnp-context-manager.c
+++ b/libgupnp/gupnp-context-manager.c
@@ -633,7 +633,7 @@ gupnp_context_manager_rescan_control_points (GUPnPContextManager *manager)
  * @control_point: The #GUPnPControlPoint to be taken care of
  *
  * By calling this function, you are asking @manager to keep a reference to
- * @control_point until it's associated #GUPnPContext is no longer available.
+ * @control_point until its associated #GUPnPContext is no longer available.
  * You usually want to call this function from
  * #GUPnPContextManager::context-available handler after you create a
  * #GUPnPControlPoint object for the newly available context.
@@ -657,7 +657,7 @@ gupnp_context_manager_manage_control_point (GUPnPContextManager *manager,
  * @root_device: The #GUPnPRootDevice to be taken care of
  *
  * By calling this function, you are asking @manager to keep a reference to
- * @root_device when it's associated #GUPnPContext is no longer available. You
+ * @root_device when its associated #GUPnPContext is no longer available. You
  * usually want to call this function from
  * #GUPnPContextManager::context-available handler after you create a
  * #GUPnPRootDevice object for the newly available context.