be a little bit more verbose about how to use the GA tracking code

addresses executablebooks#115

jupyter_book/book_template/_config.yml

@@ -83,10 +83,10 @@ scholar:
 #######################################################################################
 # Option to add a Goggle analytics tracking code
 
+# Navigate to https://analytics.google.com, add a new property for your jupyter book and copy the tracking id here.
 google_analytics:
   mytrackingcode:
 
-
 #######################################################################################
 # Jupyter book settings you probably don't need to change