I was surprised to se that there consistently is an "Also see"-section on this wiki (example). The heading I would expect is "See also", which is used e.g. on Wikipedia (example). I think "See also" is clearly more common than "Also see" in this context. My question is whether "Also see" should be regarded as incorrect.
My interpretation of the syntax is that the heading starts a sentence of sorts, where the items that follow are proper nouns, and that "Also see" is an incorrect way to start such a sentence. For example "See also Pythagoras' theorem" is a grammatically correct full sentence, while, as far as I understand, "Also see Pythagoras' theorem" is not correct without a comma between "Also" and "see".
I have also found a discussion on another wiki, where "Also see" is argued to be incorrect on the grounds that the adverb ("also") should precede "its object" (the items that follow) as closely as possible. The thinking is that it is what one is seeing that changes, not the seeing itself (as if one has just been tasting or smelling). I'm not sure whether this reasoning is reliable.