Fix docs re PHP server

Author: jim-parry

user_guide_src/source/installation/index.rst

@@ -54,6 +54,9 @@ By default, the application will run using the "production" environment. To
 take advantage of the debugging tools provided, you should set the environment
 to "develop".
 
+.. caution:: Using PHP's built-in web server is likely to cause problems,
+	as it does not process the `.htaccess` file used to properly handle requests.
+
 That's it!
 
 If you're new to CodeIgniter, please read the :doc:`Getting

user_guide_src/source/installation/troubleshooting.rst

@@ -28,3 +28,12 @@ do this open your *application/Config/App.php* file and change this::
 To this::
 
 	public $indexPage = 'index.php?';
+
+The tutorial gives 404 errors everywhere :(
+-------------------------------------------
+
+You can't follow the tutorial using PHP's built-in web server.
+It doesn't process the `.htaccess` file needed to route
+requests properly.
+
+The solution: use Apache to server your site.

user_guide_src/source/tutorial/index.rst

@@ -33,6 +33,11 @@ through the following pages:
 -  :doc:`Conclusion <conclusion>`, which will give you some pointers on
    further reading and other resources.
 
+.. caution:: Using PHP's built-in web server is likely to cause problems,
+	as it does not process the `.htaccess` file used to properly handle requests.
+        Use your favorite web server instead.
+
+
 Enjoy your exploration of the CodeIgniter framework.
 
 .. toctree::