Docs update

[AdamKufel]

Minor updates to docs

[mikegrima]

The only change in the doc required is:
$ monkey add_account_aws --id $account --name $name --role_name SecurityMonkey

The connection string does not contain a typo, postgresql is correct. The other changes are not needed.

[AdamKufel]

Indeed it contains a typo, in documentation (https://github.com/Netflix/security_monkey/blob/develop/docs/options.md) it's stated:

"SQLALCHEMY_DATABASE_URI = 'postgressql://<user>:<password>@<hostname>:5432/SecurityMonkey'"

there is "postgressql" (double "ss") but correct protocol is "postgresql" (one "s")

[mikegrima]

Sorry -- I misread.

Can you update your PR to only make those really small updates? Some of the numbering formatting is broken in the current PR.