doc: note that x509 cert parsing rejects some more certs now
doc: note that x509 cert parsing rejects some more certs now

Fixes #23711

Cofyc/go,nawawi/go,golang/go,CAFxX/go,akutz/go,christopher-henderson/Go,cloudflare/go,Cofyc/go,Cofyc/go,golang/go,cloudflare/go,codestation/go,cloudflare/go,golang/go,akutz/go,Cofyc/go,CAFxX/go,golang/go,codestation/go,nawawi/go,nawawi/go,nawawi/go,akutz/go,codestation/go,josharian/go,josharian/go,akutz/go,golang/go,CAFxX/go,codestation/go,josharian/go,cloudflare/go,codestation/go,josharian/go,cloudflare/go,golang/go,nawawi/go,josharian/go,akutz/go,cloudflare/go,nawawi/go,CAFxX/go,cloudflare/go,CAFxX/go,nawawi/go,akutz/go,Cofyc/go,CAFxX/go,codestation/go,golang/go,akutz/go,golang/go,cloudflare/go,CAFxX/go,Cofyc/go,josharian/go,codestation/go,nawawi/go,CAFxX/go,josharian/go,codestation/go,josharian/go,Cofyc/go,akutz/go,Cofyc/go