Spell check and borrowing chapters!

Wiki/Documentation updates

• cow::borrow_chapter() function is described: https://github.com/jhudsl/OTTR_Template/wiki/Borrowing-chapters-between-courses
• Intro to OTTR exists and is in progress!: https://jhudatascience.org/Intro_to_OTTR/
• Minor update automatic issues and wiki based on various changes over time

Template/style changes:

• None

Github action changes:

• Spell check prints out the results in a comment on the pull request
• Docker image tag is fixed

Docker image updates:

• jhudsl/cow now has cow::borrow_chapter() function

What's Changed

• Try adding spelling errors GHA comment by @cansavvy in #371
• Update issues and advice by @cansavvy in #372

Full Changelog: 1.4...1.5