Add QUIC protocol check in help()

Author: drwetter

testssl.sh

@@ -21237,7 +21237,7 @@ single check as <options>  ("$PROG_NAME URI" does everything except -E and -g):
      -E, --cipher-per-proto        checks those per protocol
      -s, --std, --categories       tests standard cipher categories by strength
      -f, --fs, --forward-secrecy   checks forward secrecy settings
-     -p, --protocols               checks TLS/SSL protocols (including SPDY/HTTP2)
+     -p, --protocols               checks TLS/SSL protocols, for HTTP: including QUIC/HTTP/3 and ALPN/HTTP2 (and SPDY)
      -g, --grease                  tests several server implementation bugs like GREASE and size limitations
      -S, --server-defaults         displays the server's default picks and certificate info
      -P, --server-preference       displays the server's picks: protocol+cipher