[gnome-documents] Fixed typo in string

[Daniel Mustieles García <dmustieles src gnome org>]

commit 6e92dcc120ab401bb172eeca32555d2683c4b468
Author: Daniel Mustieles <daniel mustieles gmail com>
Date:   Mon Mar 17 10:49:28 2014 +0100

    Fixed typo in string

 help/C/prob-no-show.page |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/C/prob-no-show.page b/help/C/prob-no-show.page
index 9251f9a..55861a0 100644
--- a/help/C/prob-no-show.page
+++ b/help/C/prob-no-show.page
@@ -43,7 +43,7 @@
     <p>Add links to Tracker docs, XDG paths.</p>
   </comment>
 
-  <p><app>Documents</app> supports only sertain types of documents such as
+  <p><app>Documents</app> supports only certain types of documents such as
   PDFs and office suite documents such as spreadsheets and word processor
   documents. It will not show text documents and photos.</p>