[DOC][5.3] Error in paragraph 3
Created by: mrnicoco
On wiki page explaining update from 5.2 to 5.3 ( https://github.com/gitlabhq/gitlabhq/blob/master/doc/update/5.2-to-5.3.md#3-install-libs-migrations-etc )
Commands and comments for mysql and postrgesql are mixed up