docs: add before login comments

[WilsonLe]

Description

• [x] I have read and understand the CONTRIBUTING.md document in this repository.

Type of change

• [x] Simple documentation change

Checklist:

• [x] I have added tests that prove my fix is effective or that my feature works
• [x] Existing test suite passes locally with my changes
• [x] I have made corresponding changes to the documentation