modules: fix typo in link to upgrading guide

27 jobs for mod_api_clarif in 24 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
canceled #286327
amd64 linux docker
archive

00:00:24

canceled #286328
amd64 linux docker
build

00:00:23

canceled #286329
amd64 linux docker
build-asan

00:00:23

canceled #286330
docker
kres-gen

00:00:23

 
  Test
canceled #286331
docker delayed
build:darwin

canceled #286332
amd64 linux docker
deckard

canceled #286333
docker delayed
doc

canceled #286334
dind
docker

canceled #286335
docker delayed
lint:other

canceled #286336
amd64 linux docker delayed
lint:pedantic

canceled #286337
amd64 linux docker
lint:scan-build

canceled #286338
amd64 linux docker
lint:tidy

canceled #286339
privileged
pkg:epel-7

canceled #286340
privileged
pkg:fedora-29

canceled #286341
amd64 linux docker
respdiff:basic

canceled #286342
amd64 linux docker delayed
test:valgrind

 
  Extended
canceled #286344
respdiff
fwd-tls6-kresd.udp6

canceled #286345
respdiff
fwd-udp6-kresd.udp6

canceled #286349
respdiff
fwd-udp6-unbound.tcp6

canceled #286350
respdiff
fwd-udp6-unbound.tls6

canceled #286348
respdiff
fwd-udp6-unbound.udp6

canceled #286347
respdiff
iter.tls6

canceled #286346
respdiff
iter.udp6

canceled #286343
amd64 linux docker
pytests

canceled #286351
respdiff
resperf:fwd-tls6.udp-asan

canceled #286352
respdiff
resperf:fwd-udp6.udp-asan

canceled #286353
respdiff
resperf:iter.udp-asan