Remove note about architecture links being private (they're now public) (#82)

Author: andyblundell

README.md

@@ -21,8 +21,6 @@ The framework is a companion to:
 * The [NHS service standard](https://service-manual.nhs.uk/service-standard), with cross-references in this format: [SERVICE-RELIABILITY](https://service-manual.nhs.uk/service-standard/14-operate-a-reliable-service)
 * The [NHS Digital architectural principles](https://digital.nhs.uk/about-nhs-digital/our-work/nhs-digital-architecture/principles), with cross-references in this format: [ARCHITECTURE-SECURITY](https://digital.nhs.uk/about-nhs-digital/our-work/nhs-digital-architecture/principles/adopt-appropriate-cyber-security-standards)
 
-Note: the architecture principles are currently private links, but will soon be public.
-
 ## Contents
 
 The framework consists of: