This commit updates the Arena Setup documentation.
* Follows RST document style guide
* Uses active voice / minor edits
* Improve document organization
I also renamed the wave-formulas.rst file since it had a typo, and was
referenced in the Arena Setup document.
This commit does the following:
* Uses ReStructuredText style guide for the announcements documentation
* Uses active voice / minor edits
* Adds examples
This was tested locally in a development environment.