login endpoint is not in "cornflow API docs"

**Is your feature request related to a problem? Please describe.**
Yes, login endpoint is missing from cornflow api docs.

**Describe the solution you'd like**
login endpoint added to docs

**Describe alternatives you've considered**
NA

**Additional context**
NA

The issue identifies the cornflow API documentation as missing the login endpoint, but names no documentation file or test. Start by locating the API docs and the existing login endpoint; done means the login endpoint is documented there.

Written by the indexing model from the issue text.