Update forms_advanced.md

Fix broken link

ruby_on_rails/advanced_forms_and_activerecord/forms_advanced.md

@@ -177,7 +177,7 @@ Sometimes Rails helper methods will do it for you, but make sure you know what y
 
   1. Read the Rails Guide on Forms section 5, which covers [populating a form with a collection of objects](https://guides.rubyonrails.org/form_helpers.html#choices-from-a-collection-of-arbitrary-objects).
   1. Read the Same Rails Guide on Forms section 10, which covers [accepting nested form data](http://guides.rubyonrails.org/form_helpers.html#building-complex-forms).
-  1. Read the Same Rails Guide on Forms section 8, which covers the [parameter conventions for nested forms](http://guides.rubyonrails.org/form_helpers.html#understanding-parameter-naming-conventions).
+  1. Read the Same Rails Guide on Forms section 8, which covers the [parameter conventions for nested forms](https://guides.rubyonrails.org/form_helpers.html#form-input-naming-conventions-and-params-hash).
   1. Read this blog post from [Peter Rhoades on working with nested forms](https://www.createdbypete.com/2014/04/04/working-with-nested-forms-and-a-many-to-many-association-in-rails-4.html). The example covers a lot of the things we've gone over so far, so follow along. Also note how he does the allowing of nested attributes in Rails 4.
 
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