bt5: mark sphinxse and myisam fulltext bt5s deprecated in favor of mroonga

bt5/erp5_full_text_myisam_catalog/bt/description

+WARNING: This BT5 is deprecated in favor of erp5_full_text_mroonga_catalog which is faster (search,
+index update, etc) than MyISAM, and has a better support for non-latin languages. Also, MyISAM fulltext
+engine creates a lock on write at table level, which may create slow downs for the whole application.
+For more information about mroonga, please see http://mroonga.org/docs/characteristic.html .
+
 This business template contains SQL methods etc. to use a MySQL MyISAM table as a fulltext storage.
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bt5/erp5_full_text_sphinxse_catalog/bt/description

+WARNING: This BT5 is experimental, and the use of erp5_full_text_mroonga_catalog is recommended for
+fulltext support, as it provides an out-of-the-box experience, and years of improvements
+based on production experience.
+
 Read http://www.erp5.org/HowToUseSphinxSE *BEFORE* installing this business template. This contains all SQL methods, scripts etc. that are required to use Sphinx Search Engine with MySQL.
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