[FIX] doc template: GA: anonymize IPs

_extensions/odoo/layout.html

@@ -39,6 +39,7 @@
     })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
 
     ga('create', '{{ google_analytics_key }}', 'auto');
+    ga('set', 'anonymizeIp', true);
     ga('send','pageview');
     </script>
   {%- endif -%}