[DOC] update migration page; add link to EOL info
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## Migrating from Log4j 1.x to 2.x
+[Log4j 1.x](http://logging.apache.org/log4j/1.2/) has
+[reached End of Life](https://blogs.apache.org/foundation/entry/apache_logging_services_project_announces)
+and is no longer supported.
This page explains how to migrate applications or libraries currently using the Log4j 1.x API
to use Log4j v2 as their main logging framework.
