doc clarifications, example fixes, grammar.
diff --git a/user_guide/libraries/sessions.html b/user_guide/libraries/sessions.html
index a3ca588..69cc6ba 100644
--- a/user_guide/libraries/sessions.html
+++ b/user_guide/libraries/sessions.html
@@ -123,7 +123,7 @@
<p>Note: Session cookies are only updated every five minutes by default to reduce processor load. If you repeatedly reload a page
you'll notice that the "last activity" time only updates if five minutes or more has passed since the last time
-the cookie was written. This time is configurable my changing the $config['time_to_update'] line in your system/config/config.php file.</p>
+the cookie was written. This time is configurable by changing the $config['time_to_update'] line in your system/config/config.php file.</p>
<h2>Retrieving Session Data</h2>