Adding a note about 404 and mod_rewrite

doc/en/quickstart/single-post.texy

@@ -36,7 +36,7 @@ class PostPresenter extends BasePresenter
 
 The `renderShow` method requires one argument - the ID of the post to be displayed. Then, it loads the post from the database and passes the result to the template.
 
-To the `app/presenters/templates/Homepage/default.latte` template we`ll add a link to the action `Post:show`.
+In the `app/presenters/templates/Homepage/default.latte` template, we’ve already created a link to the `Post:show` action, for which a template doesn’t exist yet. You can try to open a post in your browser using the link in the list on the home page. (If you see 404 error, you need to enable mod_rewrite at your webserver.) [Tracy |tracy:homepage] will show an error, because the `app/presenters/templates/Post/show.latte` template has not yet been created (if you see 404 error, you probably need to enable mod_rewrite at your webserver). Let’s add that one now:
 
 /--html
 ...