Maybe the document should say "don't worry, the installer process will walk you through this.
/tmp: well I just use tmpfs. Also the worst thing is if one searches on Google for /var /home vs. just / Debian articles, he will find ../jessie/.. and has to put in the word ../stretch/.. in the URL to get the newer version. So even if he knew which name is newer, Google doesn't so gives them all the same priority for search results... in fact backward priority. So even if you make a spanking new version, people will still find the older version. Anyway you might want to just merge the document with the installer documents.