[Templating] Added a sentence that explains what a Template Helper is

Iltar van der Berg · weaverryan · commit 6cdecde03f30 · 2014-10-29T08:23:47.000-07:00
diff --git a/components/templating/introduction.rst b/components/templating/introduction.rst
@@ -135,7 +135,8 @@ escaper using the
 Helpers
 -------
 
-The Templating component can be easily extended via helpers. The component has
+The Templating component can be easily extended via helpers. Helpers are PHP objects that 
+provide features useful in a template context. The component has
 2 built-in helpers:
 
 * :doc:`/components/templating/helpers/assetshelper`
