Update list of reserved words
Update list of reserved words

`auth` is a commonly chosen tenant name, and it became a reserved word in `14591`
See https://auth0.slack.com/archives/C1RC8M1MY/p1519738583000331
auth0/docs,jeffreylees/docs,auth0/docs,jeffreylees/docs,auth0/docs,yvonnewilson/docs,yvonnewilson/docs,yvonnewilson/docs,jeffreylees/docs