Add curl flag to cli docs

[JeffMboya]

FEATURE REQUEST

1. Is there an open issue addressing this request? If it does, please add a "+1" reaction to the
   No

2. Describe the feature you are requesting, as well as the possible use case(s) for it.
   Add curl flag to the documentation. This would be helpful for users who are using the CLI.

3. Indicate the importance of this feature to you (must-have, should-have, nice-to-have).
   should-have