docs(subrequest-auth): document required policy changes (#613)

* docs(subrequest-auth): document required policy changes

Signed-off-by: foosinn <foosinn@f2o.io>

* chore: spelling

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: foosinn <foosinn@f2o.io>
Signed-off-by: Xe Iaso <me@xeiaso.net>
Co-authored-by: Xe Iaso <me@xeiaso.net>

.github/actions/spelling/expect.txt

@@ -9,6 +9,7 @@ anubistest
 Applebot
 archlinux
 badregexes
+bdba
 berr
 bingbot
 bitcoin
@@ -27,6 +28,7 @@ caninetools
 Cardyb
 celchecker
 CELPHASE
+cerr
 certresolver
 CGNAT
 cgr
@@ -183,6 +185,7 @@ prebaked
 privkey
 promauto
 promhttp
+proofofwork
 pwcmd
 pwuser
 qualys