Issue in /src/pages/docs/authentication/index.md

[mohit-adbe]

1. JWT is being deprecated. Can we not mention it? OAuth is replacing JWT.
2. What is metascope being used for? Do we need to explain it to viewers?

[lijumjose]

@mohit-adbe

Added a note for the first comment.

Please provide a meaningful description for metascope. I will update the documentation accordingly.