Any person can read a general pan-SE list of close reasons. Any person can read a site-specific list of on-topic areas – these are available in the help center. In a few SE sites, there is a list of "do not ask" type statements.
Every SE site apparently has the option of a community-specific close reason. However, it appears that the list of the 3 or more community-specific close reasons is not available to anyone except users with the power to VTC, in particular, it is not available to new users (who do not know to look through the Flag dialog).
Since there is (apparently) some database that states what the community-specific reasons are for e.g. Law, Linguistics, Academia, Philosophy, is there a reason (technical or philosophical) that the same text cannot be automatically included in the "don't ask" (the /help/dont-ask section) of each site's Help?