[gtk-doc] Fixed a missing word in help

[Marek Černocký <mcernocky src gnome org>]

commit e60435accb87fd5244f8654797d6e9c464603cff
Author: Marek Cernocky <marek_cernocky conel cz>
Date:   Wed Sep 5 14:41:04 2018 +0200

    Fixed a missing word in help

 help/manual/C/index.docbook | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/help/manual/C/index.docbook b/help/manual/C/index.docbook
index 2c40a27..6147941 100644
--- a/help/manual/C/index.docbook
+++ b/help/manual/C/index.docbook
@@ -358,7 +358,7 @@
         required to keep the generated files under version control.
         Since GTK-Doc 1.9 it became possible to place all API information
         into source comments, which made the template support obsolete.
-        In version 1.26 template support has been.
+        In version 1.26 template support has been removed.
       </para>
 
       <para>