Apologies for the confusion caused by these legacy docs files. The folder moodle\lang\en_utf8\docs really needs to be removed, since updated content for all docs files is now contained in Moodle Docs. Please check MDL-4912 and http://docs.moodle.org/en/MoodleDocs_and_lang_packs for more details.
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Moodle documentation: Cannot access to the docs folder files
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