[ci skip] Mark the start of 3.1.10 development

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diff --git a/user_guide_src/source/installation/upgrade_3110.rst b/user_guide_src/source/installation/upgrade_3110.rst
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+##############################
+Upgrading from 3.1.9 to 3.1.10
+##############################
+
+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/* directory.
+
+.. note:: If you have any custom developed files in these directories,
+	please make copies of them first.