[gtk+] Remove redundant words from docs

[Matthias Clasen <matthiasc src gnome org>]

commit 5b2e8831616170e8a9c155700bf19c774d5cb6e9
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Feb 25 20:16:21 2016 -0500

    Remove redundant words from docs
    
    An either without an or doesn't add anything.

 gdk/gdkseat.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gdk/gdkseat.c b/gdk/gdkseat.c
index ec2bdac..0993042 100644
--- a/gdk/gdkseat.c
+++ b/gdk/gdkseat.c
@@ -111,7 +111,7 @@ gdk_seat_class_init (GdkSeatClass *klass)
    * @seat: the object on which the signal is emitted
    * @device: the newly added #GdkDevice.
    *
-   * The ::device-added signal is emitted either when a new input
+   * The ::device-added signal is emitted when a new input
    * device is related to this seat.
    *
    * Since: 3.20
@@ -131,7 +131,7 @@ gdk_seat_class_init (GdkSeatClass *klass)
    * @seat: the object on which the signal is emitted
    * @device: the just removed #GdkDevice.
    *
-   * The ::device-removed signal is emitted either when an
+   * The ::device-removed signal is emitted when an
    * input device is removed (e.g. unplugged).
    *
    * Since: 3.20