Fix another incorrect post_path link generation.

guides/source/getting_started.md

@@ -1075,7 +1075,7 @@ together.
   <tr>
     <td><%= post.title %></td>
     <td><%= post.text %></td>
-    <td><%= link_to 'Show', post_path %></td>
+    <td><%= link_to 'Show', post_path(post) %></td>
     <td><%= link_to 'Edit', edit_post_path(post) %></td>
     <td><%= link_to 'Destroy', post_path(post),
                     method: :delete, data: { confirm: 'Are you sure?' } %></td>