update getting_started guide to reduce confusion [ci skip] (#37750)

Add a yellow "NOTE" block to see if the guide looks better.

guides/source/getting_started.md

@@ -1129,8 +1129,9 @@ you attempt to do just that on the new article form
 We've covered the "CR" part of CRUD. Now let's focus on the "U" part, updating
 articles.
 
-The first step we'll take is adding an `edit` action to the `ArticlesController`,
-generally between the `new` and `create` actions, as shown:
+The first step we'll take is adding an `edit` action to the 
+`ArticlesController`, generally between the `new` and `create` 
+actions, as shown:
 
 ```ruby
 def new
@@ -1152,6 +1153,10 @@ def create
 end
 ```
 
+NOTE:  We're using `edit` to render a view. For the actual
+saving of the changes to the Article, we'll add an `update` action later.
+
+
 The view will contain a form similar to the one we used when creating
 new articles. Create a file called `app/views/articles/edit.html.erb` and make
 it look as follows:
@@ -1214,6 +1219,10 @@ Next, we need to create the `update` action in
 Add it between the `create` action and the `private` method:
 
 ```ruby
+def edit
+  @article = Article.find(params[:id])
+end
+
 def create
   @article = Article.new(article_params)