docs: Fix a documentation link

Signed-off-by: Philip Withnall <withnall@endlessm.com>
8 jobs for 1436-docs-muckery in 21 minutes and 49 seconds (queued for 15 seconds)
Status Job ID Name Coverage
  Build
passed #75411
cross-android_api21_arm64

00:02:13

passed #75412
cross-android_api28_arm64

00:02:08

passed #75413
cross-mingw64

00:02:31

passed #75410
fedora-x86_64

00:04:49

manual #75416
freebsd-11 allowed to fail manual
freebsd-11-x86_64
passed #75414
win32
msys2-mingw32

00:08:27

passed #75415
win32
vs2017-x64

00:05:36

 
  Coverage
passed #75417
coverage

00:01:39

73.3%