[gnome-builder] docs: tweak plugins title

[Christian Hergert <chergert src gnome org>]

commit f3486215eaa5c34d78021b127a49aa04eef581e5
Author: Christian Hergert <chergert redhat com>
Date:   Wed Feb 22 00:31:01 2017 -0800

    docs: tweak plugins title

 doc/plugins/index.rst |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/doc/plugins/index.rst b/doc/plugins/index.rst
index 9c61813..ca33860 100644
--- a/doc/plugins/index.rst
+++ b/doc/plugins/index.rst
@@ -1,6 +1,6 @@
-#######
-Plugins
-#######
+################
+Creating Plugins
+################
 
 .. toctree::
    :maxdepth: 3