Correct help function output in docker config.

Previously the help function output in the docker config listed port 80
as the port on which the server would listen for DNS over UDP and TCP.
However that was inconsistent with the first output line where it was
indicated to be port 53. This has now been corrected.
31 jobs for docker-print_help in 12 minutes and 20 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #216233
amd64 linux docker
build:asan:linux:amd64

00:01:14

passed #216232
amd64 linux docker
build:clang:linux:amd64

00:01:00

passed #216231
amd64 linux docker
build:linux:amd64

00:01:13

passed #216234
amd64 linux docker
srpm

00:00:43

 
  Test
passed #216242
amd64 linux docker
deckard:linux:amd64

00:01:46

passed #216250
privileged
distro:epel-7

00:02:09

passed #216249
privileged
distro:fedora-29

00:02:47

passed #216241
docker
doc

00:00:42

passed #216239
dind
docker:build

00:02:13

passed #216240
amd64 linux docker
installcheck:linux:amd64

00:00:53

passed #216243
amd64 linux docker
installcheck:valgrind:linux:amd64

00:01:43

passed #216236
docker
lint:c

00:02:40

passed #216237
docker
lint:clang-scan-build

00:01:05

passed #216235
docker
lint:lua

00:00:27

passed #216244
docker
osx:build

00:02:21

passed #216246
amd64 linux docker
pytests:lint

00:00:39

passed #216247
amd64 linux docker
pytests:run

00:01:51

passed #216248
amd64 linux docker
respdiff:iter:udp:linux:amd64

00:02:06

passed #216238
amd64 linux docker
test:linux:amd64

00:00:58

passed #216245
amd64 linux docker
test:linux:amd64:valgrind

00:01:20

 
  Extended
passed #216251
amd64 linux docker
pytests:extended

00:08:14

canceled #216252
respdiff
respdiff:fwd-tls6-kresd.udp6

00:00:10

canceled #216253
respdiff
respdiff:fwd-udp6-kresd.udp6

00:00:11

canceled #216257
respdiff
respdiff:fwd-udp6-unbound.tcp6

00:00:11

canceled #216258
respdiff
respdiff:fwd-udp6-unbound.tls6

00:00:12

canceled #216256
respdiff
respdiff:fwd-udp6-unbound.udp6

00:00:13

canceled #216255
respdiff
respdiff:iter.tls6

00:00:14

passed #216254
respdiff
respdiff:iter.udp6

00:00:14

passed #216259
respdiff
resperf:fwd-tls6.udp-asan

00:00:15

passed #216260
respdiff
resperf:fwd-udp6.udp-asan

00:00:15

passed #216261
respdiff
resperf:iter.udp-asan

00:00:14