Add codeowners for documentation #17928

Job	Run time
Check if image exists in registry	14s
licensing	2m 56s
cancel	2s
pyflakes	2m 6s
linux (ubuntu-20.04, debug)	1h 33m 52s
linux-fpga (ubuntu-20.04, debug)	1h 34m 33s
linux (ubuntu-20.04, release)	1h 8m 38s
linux (ubuntu-20.04, codecov)	1h 3m 35s
Build SLES image	54m 45s
Build image	56m 18s
sles	2m 2s
format	5m 26s
cppcheck	48m 48s
tidy	1h 11m 12s
	9h 24m 27s

Provide feedback