Getting Started rewrite after testing

I tested the getting started guide and found some issues, so I rewrote that section to increase its clarity.

Various changes requested by Sabby

Sabby reviewed the previous commit and found some issues. I have addressed those. This commit also fixes issue #3012 (a typo, but a major one, since it misspelled Spring in a heading).

Further response to feedback

I missed the "Load More" button in Github, so I had to make some more changes to account for things Sabby Anandan found. Done now. Thanks, Sabby.

Polishing on merge

Author: Jay Bryant