docs: fix config name in update (#13039)

Fixes #13028

Author: krishnaanaril

docs/documentation/stories/1.0-update.md

@@ -77,7 +77,7 @@ If the old Angular CLI package _still_ persists, you'll need to research how to
 
 ## .angular-cli.json
 
-`angular-cli.json` is now `.angular-cli.json`, but we still accept the old config file name.
+`angular-cli.json` is now `angular.json`, but we still accept the old config file name.
 
 A few new properties have changed in it: