One-time PR for Doc Reviews

@croche-okta @wdawson-okta @srinivasanagandla-okta @stsai-okta @lboyette-okta @hoanguyen-okta @karlmcguinness-okta @cwu-okta @tthompson-okta @eklein-okta

Hi team,

Since the material has been pushed to master, this pull request is a little unusual. Please add any comments to the docs here by the end of the day Monday, September 29, 2014. I will make changes and create a new branch and a new PR for the changes. Then, I will discard this PR. 

Please ping me if this doesn't work for you.

Thanks,
Evan
Sorry for all the back-and-forth, out of date wikis and everything else changing every other day. We went full circle on this parameter, and landed on calling it "username" instead of "login". Also the description "URL of the user to authenticate" is wrong, it should just be the Okta username of the user to authenticate. The short form (omitting the @example.com) is supported here as well.