docs: trivial typo fixes

https://bugzilla.gnome.org/show_bug.cgi?id=767949

docs/reference/gio/gdbus-codegen.xml

@@ -680,7 +680,7 @@ my_app_frobber_proxy_new_sync   (GDBusConnection     *connection,
       the generated methods such as
       <function>my_app_frobber_call_hello_world()</function> to invoke
       the <function>net.Corp.MyApp.Frobber.HelloWorld()</function>
-      D-Bus method, connect to the the
+      D-Bus method, connect to the
       <function>::notification</function> GObject signal to receive
       the <function>net.Corp.MyApp.Frobber::Notication</function>
       D-Bus signal and get/set the

docs/reference/gio/migrating-gdbus.xml

@@ -21,7 +21,7 @@
           url="http://www.freedesktop.org/wiki/Software/dbus#ReferenceImplementation.28dbus-daemonandlibdbus.29">libdbus
           reference implementation</ulink>, GDBus doesn't. Instead, it
           relies on GIO streams as transport layer, and has its own
-          implementation for the the D-Bus connection setup and
+          implementation for the D-Bus connection setup and
           authentication. Apart from using streams as transport,
           avoiding libdbus also lets GDBus avoid some thorny
           multithreading issues.