There are several meta questions that discuss whether questions should include fluff such as salutations and thank yous, but these tend to be long pages, many of which include related topics, such as automatic text removal. They're great for moderators but overwhelming for newbies.
Is there a simple help page that concisely states that "Hi", "Thanks", etc. are not desirable in questions or answers along with a brief rationale? If not, how about creating one? It would be nice to paste the URL to that page in the comment for edits that include fluff removal.