[gnome-builder] doc: fix typo

[Matthew Leeds <mwleeds src gnome org>]

commit 49f3309fea790f1ec0c6978155b5c0db5c844a8f
Author: Matthew Leeds <mleeds redhat com>
Date:   Wed Mar 8 19:28:36 2017 -0600

    doc: fix typo

 doc/plugins/workbench/actions.rst |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/doc/plugins/workbench/actions.rst b/doc/plugins/workbench/actions.rst
index 4be4018..d3c5894 100644
--- a/doc/plugins/workbench/actions.rst
+++ b/doc/plugins/workbench/actions.rst
@@ -31,4 +31,4 @@ This adds a new action named ``hello`` to the workbench.
 It can be connected to widgets by using the ``win.hello`` action-name.
 Additionally, you can call the action with ``hello`` from the command bar.
 
-To toggle whether or not the action can be activated. set the ``Gio.SimpleAction:enabled`` property.
+To toggle whether or not the action can be activated, set the ``Gio.SimpleAction:enabled`` property.