minor formating fixes

[cherman2]

Purpose/implementation Section

Minor Markdown fixes to adress weird formating.

@cansavvy, this is ready for your review! Should be just a couple of rmd formating issues

New Content Checklist

• New content/chapter is in an Rmd file with this kind of format and headers.

• New content/chapter contains Learning Objectives and are in the correct format.

• Bookdown successfully re-renders and any new content files have been added to the _bookdown.yml.

• Spell check runs successfully in Github actions style-n-check).

• Any newly necessary packages that are needed have been added to the Dockerfile and image.

• Images are in the correct format for rendering.

• Every new image has alt text and is in a Google Slide.

• Each slide is described in the notes of the slide so learners relying on a screen reader can access the content. See https://lastcallmedia.com/blog/accessible-comics for more guidance on this.

• The color palette choices of the slide are contrasted in a way that is friendly to those with color vision deficiencies.
  You can check this using Color Oracle.

[cansavvy]

LGTM