[gtkmm-documentation] Fixed typo in string

[Daniel Mustieles GarcÃa <dmustieles src gnome org>]

commit d16f950e479e2aaaecae4992dec74ada2cbe32aa
Author: Daniel Mustieles <daniel mustieles gmail com>
Date:   Tue Jun 5 13:34:42 2012 +0200

    Fixed typo in string

 docs/tutorial/C/gtkmm-tutorial-in.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/tutorial/C/gtkmm-tutorial-in.xml b/docs/tutorial/C/gtkmm-tutorial-in.xml
index a8942fb..e72090b 100644
--- a/docs/tutorial/C/gtkmm-tutorial-in.xml
+++ b/docs/tutorial/C/gtkmm-tutorial-in.xml
@@ -5697,7 +5697,7 @@ if (info)
       of communication between processes is deliberately kept very simple: The
       <classname>Plug</classname> writes its ID out to a text file named
       <filename>plug.id</filename> and the process with the socket reads the ID
-      from this files. In a real program, you may want to use a more
+      from this file. In a real program, you may want to use a more
       sophisticated method of inter-process communication.
     </para>
     <para><ulink url="&url_examples_base;socket/">Source Code</ulink></para>