anchor.diff:          type = types.nullOr types.str;
           default = null;
           description = ''
  -          ACME Directory Resource URI. Defaults to let's encrypt
  +          ACME Directory Resource URI. Defaults to Let's Encrypt's
             production endpoint,
  -          https://acme-v02.api.letsencrypt.org/directory, if unset.
  +          <link xlink:href="https://acme-v02.api.letsencrypt.org/directory"/>, if unset.
           '';
         };
   
         domain = mkOption {
           type = types.str;
           default = name;
  -        description = "Domain to fetch certificate for (defaults to the entry name)";
  +        description = "Domain to fetch certificate for (defaults to the entry name).";
         };
   
         email = mkOption {
  
positive.code:         type = types.nullOr types.str;
          default = null;
          description = ''
            ACME Directory Resource URI. Defaults to let's encrypt
            production endpoint,
            <literal>https://acme-v02.api.letsencrypt.org/directory</literal>, if unset.
          '';
        };
  
  
negative.code:         type = types.bool;
          default = false;
          description = ''
            Accept the CA's terms of service. The default provider is Let's Encrypt,
            you can find their ToS at <link xlink:href="https://letsencrypt.org/repository/"/>.
          '';
        };
  
  