move example blacklist_helo list to docs/ with instructions to install

Jesse Norell

2016-02-08 8c8acac7bb7160e3833b9351bccb8d9c643bddf6

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<tmpl_dyninclude name="content_tpl">
<input type="hidden" name="_csrf_id" value="{tmpl_var name='_csrf_id'}" />
<input type="hidden" name="_csrf_key" value="{tmpl_var name='_csrf_key'}" />