Merge pull request #21048 from yui-knk/fix/guide_about_action_pack2

[ci skip] Add a link to action_controller_overview.html

guides/source/action_view_overview.md

@@ -15,7 +15,7 @@ After reading this guide, you will know:
 What is Action View?
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-In Rails, web requests are handled by Action Controller and Action View. Typically, Action Controller will be concerned with communicating with the database and performing CRUD actions where necessary. Action View is then responsible for compiling the response.
+In Rails, web requests are handled by [Action Controller](action_controller_overview.html) and Action View. Typically, Action Controller will be concerned with communicating with the database and performing CRUD actions where necessary. Action View is then responsible for compiling the response.
 
 Action View templates are written using embedded Ruby in tags mingled with HTML. To avoid cluttering the templates with boilerplate code, a number of helper classes provide common behavior for forms, dates, and strings. It's also easy to add new helpers to your application as it evolves.