Fixed double-space typo.
diff --git a/user_guide/installation/upgrade_150.html b/user_guide/installation/upgrade_150.html
index 342d486..9cd0089 100644
--- a/user_guide/installation/upgrade_150.html
+++ b/user_guide/installation/upgrade_150.html
@@ -57,7 +57,7 @@
 
 <h1>Upgrading from 1.4.1 to 1.5.0</h1>
 
-<p class="important"><strong>Note:</strong> The instructions on this page assume you are running version 1.4.1.  If you
+<p class="important"><strong>Note:</strong> The instructions on this page assume you are running version 1.4.1. If you
 have not upgraded to that version please do so first.</p>
 
 <p>Before performing an update you should take your site offline by replacing the index.php file with a static one.</p>
@@ -105,7 +105,7 @@
 |--------------------------------------------------------------------------
 |
 | This item allows you to set the filename/classname prefix when extending
-| native libraries.  For more information please see the user guide:
+| native libraries. For more information please see the user guide:
 |
 | http://codeigniter.com/user_guide/general/core_classes.html
 | http://codeigniter.com/user_guide/general/creating_libraries.html
@@ -120,7 +120,7 @@
 |
 | If your PHP installation does not have short tag support enabled CI
 | can rewrite the tags on-the-fly, enabling you to utilize that syntax
-| in your view files.  Options are TRUE or FALSE (boolean)
+| in your view files. Options are TRUE or FALSE (boolean)
 |
 */
 $config['rewrite_short_tags'] = FALSE;
@@ -136,7 +136,7 @@
 |--------------------------------------------------------------------------
 |
 | If you would like errors or debug messages logged set this variable to
-| TRUE (boolean).  Note: You must set the file permissions on the "logs" folder
+| TRUE (boolean). Note: You must set the file permissions on the "logs" folder
 | such that it is writable.
 |
 */