[gnome-software] trivial: Fix typo in docstring

[Robert Ancell <rancell src gnome org>]

commit 35a09b47e8b70cee97ba695bff94d5d05869b5e8
Author: Robert Ancell <robert ancell canonical com>
Date:   Wed Nov 22 14:48:12 2017 +1300

    trivial: Fix typo in docstring

 lib/gs-app.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/lib/gs-app.c b/lib/gs-app.c
index 50a52c0..e757572 100644
--- a/lib/gs-app.c
+++ b/lib/gs-app.c
@@ -2431,7 +2431,7 @@ gs_app_set_origin_hostname (GsApp *app, const gchar *origin_hostname)
  * @app: a #GsApp
  * @screenshot: a #AsScreenshot
  *
- * Adds a screenshot to the applicaton.
+ * Adds a screenshot to the application.
  *
  * Since: 3.22
  **/