exampleSite/config.toml: Document disable_sri option

exampleSite/config.toml

@@ -74,6 +74,10 @@ paginate = 5
   # Display post summaries instead of content in list templates (default: true)
   #truncate = true
 
+  # Disable the use of sub-resource integrity on CSS/JS assets (default: false)
+  # Useful if you're using a CDN or other host where you can't control cache headers
+  #disable_sri = false
+
   [params.sidebar]
     # Optional about block for sidebar (can be Markdown)
     about = "A simple Hugo theme based on the [Bootstrap v4 blog example](http://v4-alpha.getbootstrap.com/examples/blog/)."