[ci skip] Update the upgrade instructions

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diff --git a/user_guide_src/source/installation/upgrade_213.rst b/user_guide_src/source/installation/upgrade_213.rst
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+#############################
+Upgrading from 2.1.2 to 2.1.3
+#############################
+
+Before performing an update you should take your site offline by
+replacing the index.php file with a static one.
+
+Step 1: Update your CodeIgniter files
+=====================================
+
+Replace all files and directories in your "system" folder.
+
+.. note:: If you have any custom developed files in these folders please
+	make copies of them first.
+
+Step 2: Update your user guide
+==============================
+
+Please also replace your local copy of the user guide with the new
+version.
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