use the new referrer policy directive values. convert reflectedxss and reflectedxss directive values to lowercase. fix misspelling of referrer. improved documentation.
use the new referrer policy directive values.
convert reflectedxss and reflectedxss directive values to lowercase.
fix misspelling of referrer.
improved documentation.

Signed-off-by: Tom <dc76e9f0c0006e8f919e0c515c66dbba3982f785@d9ping.nl>

D9ping/CSPGenerator