[ci skip] Merge pull request #5592 from Tusharmalik/develop

corrected the serial number of 'source/installation/upgrade_319'
diff --git a/user_guide_src/source/installation/upgrade_319.rst b/user_guide_src/source/installation/upgrade_319.rst
index 3b8da33..db56cac 100644
--- a/user_guide_src/source/installation/upgrade_319.rst
+++ b/user_guide_src/source/installation/upgrade_319.rst
@@ -13,9 +13,9 @@
 .. note:: If you have any custom developed files in these directories,
 	please make copies of them first.
 
-********************************
-Step 3: Replace config/mimes.php
-********************************
+
+Step 2: Replace config/mimes.php
+================================
 
 This config file has received some updates. Please copy it to
 *application/config/mimes.php*.