chore: Add few todos

docs/authentication.mdx

@@ -11,6 +11,8 @@ Continuwuity implements the following authentication flows:
 
 Different sets of clients support different flows, but most clients are moving towards next-gen auth. One can set which login mode(s) are allowed via the `compatibility_mode` variable of the `[global.oauth]` config file section.
 
+{/* TODO: !important Annontation block for .well-known/matrix/client requirement */}
+
 ## Authentication sources
 
 Continuwuity can read user authentication data from the following sources:
@@ -27,4 +29,4 @@ When configuring Delegated authentication, **legacy login will be implicitly dis
 See the following pages for further details:
 
 - [**Registration and email configuration**](./authentication/registration)
-- [**Delegated authentication**](./authentication/oidc)
+- [**Delegated authentication**](./authentication/oidc)