Fixed typo

I think it's supposed to be an upper-case 'F'. Cheers :)

Author: AustenDSouza

docs/tutorial/introduction.rst

@@ -3,7 +3,7 @@
 Introducing Flaskr
 ==================
 
-We will call our blogging application flaskr, but feel free to choose your own
+We will call our blogging application Flaskr, but feel free to choose your own
 less Web-2.0-ish name ;)  Essentially, we want it to do the following things:
 
 1. Let the user sign in and out with credentials specified in the