Clarify call tokens

[sachaarbonel]

Summary:

Updated the documentation to clarify the functionality of call tokens and their role in access management.

Changes:

• Revised the description of call tokens to explain they grant additional access.
• Added a note to clarify that call tokens do not restrict access and that most call types allow regular users to join calls.
• Provided guidance on the correct setup for managing call access when using call tokens.
• Fixed the markdown format for notes from "Note:" to "> Note:".