Add semantic linebreaks to Passphrase_policy and Updates_policy
    
    The mentioned two pages were not using semantic linebreaks. To make
    things more consistent, and support Pagure pull request review, add
    them.
    
    Also, remove `link:` prefix from https:// URLs, which are formatted as
    links even without it.
    
    Also, change some strange formatting choices to be standard lists.