docs(chart_template_guide): Attempt to fix stray text

The live docs.helm.sh site is currently rendering some stray text after
index.md.  One theory is that the lack of a trailing newline at the end of
the file is confusing the html generator.  Give it a shot.

docs/chart_template_guide/index.md

@@ -13,4 +13,4 @@ This guide focuses on the following concepts:
 - Using values
 - Techniques for working with templates
 
-This guide is oriented toward learning the ins and outs of the Helm template language. Other guides provide introductory material, examples, and best practices.
+This guide is oriented toward learning the ins and outs of the Helm template language. Other guides provide introductory material, examples, and best practices.