v.io/v23/security: Remove unnecessary cruft from the large doc comment describing how to interact with the security package.
v.io/v23/security: Remove unnecessary cruft from the large doc comment
describing how to interact with the security package.

This is cleanup from my recent security.Call -> *context.T api change.

Change-Id: Ia36b0128bb03fcf5c0155752f743cb8e14ec9783

vanadium/go.v23,vanadium/go.v23,vanadium/go.v23