Use Colspan in th Tags

Is it more suitable that using ```<th colspan="3">``` instead of three empty ```<th>```? It is simple, but what i am missing about it?

Change repetitive th tags to use colspan attribute

Update CHANGELOG.md

Update CHANGELOG.md

guides/CHANGELOG.md

@@ -1,3 +1,5 @@
-* No changes.
+*   Removed repetitive th tags. Instead of them added one th tag with a colspan attribute.
+    
+    *Sıtkı Bağdat*
 
 Please check [4-0-stable](https://github.com/rails/rails/blob/4-0-stable/guides/CHANGELOG.md) for previous changes.

guides/source/getting_started.md

@@ -932,8 +932,7 @@ appear next to the "Show" link:
   <tr>
     <th>Title</th>
     <th>Text</th>
-    <th></th>
-    <th></th>
+    <th colspan="2"></th>
   </tr>
 
 <% @posts.each do |post| %>
@@ -1073,9 +1072,7 @@ together.
   <tr>
     <th>Title</th>
     <th>Text</th>
-    <th></th>
-    <th></th>
-    <th></th>
+    <th colspan="3"></th>
   </tr>
 
 <% @posts.each do |post| %>

railties/CHANGELOG.md

@@ -12,5 +12,9 @@
     moved to class methods in Railtie and the Railtie has been made abstract.
 
     *John Wang*
+    
+*   Changes repetitive th tags to use colspan attribute in `index.html.erb` template.
+    
+    *Sıtkı Bağdat*
 
 Please check [4-0-stable](https://github.com/rails/rails/blob/4-0-stable/railties/CHANGELOG.md) for previous changes.

railties/lib/rails/generators/erb/scaffold/templates/index.html.erb

@@ -6,9 +6,7 @@
 <% attributes.reject(&:password_digest?).each do |attribute| -%>
       <th><%= attribute.human_name %></th>
 <% end -%>
-      <th></th>
-      <th></th>
-      <th></th>
+      <th colspan="3"></th>
     </tr>
   </thead>