Standardize headings, wording, and inline comments across tutorials#263

jkrick wants to merge 3 commits intoCaltech-IPAC:mainCaltech-IPAC/irsa-tutorials:mainfrom

jkrick:codex/review-tutorial-numbering-and-headingsjkrick/irsa-tutorials:codex/review-tutorial-numbering-and-headingsCopy head branch name to clipboard