Update profiling.rst
There is some confusion about how to enable profiling for queries. This will save some time for devs who want to debug their generated SQL.
diff --git a/user_guide_src/source/general/profiling.rst b/user_guide_src/source/general/profiling.rst
index f29af81..4945b39 100644
--- a/user_guide_src/source/general/profiling.rst
+++ b/user_guide_src/source/general/profiling.rst
@@ -82,6 +82,8 @@
hidden.
======================= =================================================================== ========
-.. note:: Disabling the **save_queries** setting in your database configuration
+.. note:: Disabling the [save_queries](http://ellislab.com/codeigniter/user-guide/database/configuration.html) setting in your database configuration
will also effectively disable profiling for database queries and render
- the 'queries' setting above useless.
\ No newline at end of file
+ the 'queries' setting above useless. You can optionally override this
+ setting with `$this->db->save_queries = TRUE;`. Without this setting you
+ won't be able to view the queries or the [last_query](http://ellislab.com/codeigniter/user-guide/database/helpers.html).