Add docs for setting up mysql 5.7 for Mac OS X. (#807)
Add docs for setting up mysql 5.7 for Mac OS X. (#807)

* Add docs for setting up mysql 5.7 for Mac OS X.

* Fix typo and add brew install mysql.

all-of-us/raw-data-repository,all-of-us/raw-data-repository,all-of-us/raw-data-repository