docs(plugins/acme) add doc for dummy route setup and staging cleaning (#1843)
docs(plugins/acme) add doc for dummy route setup and staging cleaning (#1843)

Co-Authored-By: lena-larionova <f2067920b16f0da6711eb84739d83dcaca411c08@users.noreply.github.com>

Mashape/getkong.org,Mashape/getkong.org,Mashape/getkong.org