docs(tutorial/index): improve punctuation

ruben1 · pkozlowski-opensource · commit 081fef60b240 · 2014-12-14T09:50:28.000+01:00
Closes angular#10449
diff --git a/docs/content/tutorial/index.ngdoc b/docs/content/tutorial/index.ngdoc
@@ -160,7 +160,7 @@ globally and run directly from a terminal/command prompt. You don't need to do t
 tutorial, but if you decide you do want to run them directly, you can install these modules globally
 using, `sudo npm install -g ...`.
 
-For instance to install the Bower command line executable you would do:
+For instance, to install the Bower command line executable you would do:
 
 ```
 sudo npm install -g bower
